Well, this is Renderosity's site, store, server and bandwidth we're talking about.  They reserve the right to refuse anyone anything.  At least, that should be the way their policies read.

As far as the product in question, I did see it listed on another site.  I looked at it.  I believe I was looking at the correct product.

Here's some constructive criticism.  I mean this is the best spirit possible in regards to supporting an artist in a competitive market. 

What can I say?  It's "another character."  I'm not trying to be harsh but you have to look at it from the point of view of a marketer and, more importantly, a consumer.  What about this is unique?  What does this package offer that can not be obtained in other packages?  The only thing unique appears to be some tattoos, if I'm looking at the right product.  The rest of it is "Someone else has already done it" type of material.  That's not always a bad thing.  Some users might like having several variations on a very similar theme.  But, does this give even rabid fans of this type of character anything unique?  Is there anything here even they would want?  Are there any morphs that aren't dialspins?  Unique textures?  Hair?  Clothing?  Accessories?  The only thing unique offered are some tattoos, maybe the ear morphs (depending on how they were done) lights (which are a dime a dozen unless you're talking about IBL/HDRI/Gels or very, very high quality arrangements etc.) and expressions (which may or may not be unique).  )Makeup, base texture, etc doesn't seem very "unique" for this product.

It may be the culmination of years of active learning and experience.  It may be the pinnacle of an artist's achievements.  But, if it isn't unique, doesn't offer something of value over and above what is already available in the market, nobody is going to buy it.  They'll look at it and say "That's neat" and click on down the line of "What's new."

My suggestions, in general,  would be this:

1)  Mesh is king.  Whether it is a totally original mesh or a hand-done morph that isn't a dialspin, Mesh is king, always.  With that in mind, anything that is a unique mesh or contains one increases the overall value.  If it is something other than a mesh or a morph that is done by hand without relying on dialspins, then it must offer something unique or be of the best recognizable quality possible.  I used "recognizable" in that statement because it may actually be the best thing since sliced bread but if nobody can tell that from the presentation of the advertisement, they won't "recognize" it as such.  But, it's worth repeating: Mesh is king.  If it isn't mesh, then it had best demonstratably stand out amongst the legions of competing products in its category. (Textures, dialspins, lights, expressions, poses, materials, etc..)

2. Textures are great.  But, at some point, there's a saturation limit where they no longer offer added value in a package.  Fifteen bajillion textures lend no more value to a package than three extra ones do. (IMO)  This applies to everything, characters ESPECIALLY.  You can use one texture at a time on one model at a time. (for most practical purposes)  After that, textures become sort of redundant and you end up with two textures that are actually used and a runtime full of stuff that never gets loaded, ever.

3) Added "bonuses" should really be bonuses or they're not worth mentioning as such.  That means unless they too have something very unique and desirable above and beyond what is offered, they're just part of the package.  A toothbrush that has listed a bonus of "Free Bristles Attached" isn't really saying anything.

4) Nothing in the presentation of the product at the market it is located seems to have much to say about the quality of the product other than the text describing it as a quality product.  I'm a stickler for renders, lit meshes and highlights of special features.  If the render is bad, the product is bad and that is regardless of what people have to say about "Let them see the default render in default lighting."  Sure, include that.  But, I want to see the bestest thing with the mostest bang for my buck I could get out of using this product.  (within reason and without cheating with unincluded special IBLs, shaders, etc..)  Otherwise, what is being said is "This is the worst this product will ever look."  I want to see the best it will ever look along with it's best features.  That's what sells products, IMO.

I am truly sorry your friend's product was not accepted.  I wouldn't mind selling some products on Renderosity myself one day.  So, I can sympathize.  But, me just posting "Gee, that's too bad.  I'm sorry their experience was a bad one." doesn't do the Artist any good, does it?  What I have said may anger someone but, it's the truth as I see it.  I would rather have them angry at some perceived insult from me and actively selling products they create because they acted on what I said rather than them not selling anything at all.