If you don't release it how will you ever know if it's really useful to anyone? Put it out there and let it compete. Maybe you don't sell a single one, but that in itself will give you valuable information that you can use going forward (maybe there isn't really a market for your item, or you'll have to take a look at the competing product and figure out why people like it better than yours in that case but that's worth quite a bit).

I mean really - how many different breast morphing/manipulation items are out there for sale? People buy the good ones even so right?

Hopefully you put it out there, some people buy it and leave feedback, which you can use to improve it and your subsequent works and you make a few sheckles into the bargain.

Don't look at it as a one off profit making venture - look at it as one part of your growing portfolio of work. You'll get your name out there, some exposure that might help your future works get more response. Who knows, after you release some other quality stuff people will look at your "also offered by" section, see this thing and pick it up because your other stuff is good.

In short, you've got nothing to lose by releasing it, and much to gain.

PS. Despite what other people have said if all other things are equal, the deciding factor will be price - so a lower price won't hurt.