Opinion here...

Should be 5 per User... Not 5 per catagory. That defeats the purpose of having limits.

I, too, have been getting annoyed with the recent spam...

Bobby, you might want to find out the props used in the Tubes and make sure there are not EULA violations as well. Issues have come up in the past where people were redistrubing 2d background made from Daz3d products in direct violation of their EULA.

For example, Balcony Background uses a Platinum Club item, the SS Balcony. And the Graffiti Background looks like a Freebie that was posted here by Richabri... The Shoehouse background is again a Daz3D product. The Ancient room is a Poserworld Set.

It's a suggest, but Daz does have the prohibition on creating 2d backgrounds in direct competition to their products.