I have one single set for sale, at DAZ, part of a collaboration package.
My first commercial item ever. It got accepted very quickly. Why? Simple. Catering to the mood in the market (well, one of my business did that. His business acumen is far greater than mine). High quality, and not submitting until I was pretty sure the item was meeting or exceeding quality standards.
QA found only a few little things that I had overlooked, and those were quickly fixed. In fact, they told me that the package was unusually well made for something entering the first testing rounds.

THAT's what gets your items in a store. High quality, originality and uniqueness.
Not only did my stuff get into the DAZ store, the pack it is a part of did rather well too. It ended up being one of the 2008 top sellers at DAZ. Not bad for a newbie merchant, eh?

I'll be making more commercial items. I'll do my best to make them as original as possible, to make them as high quality as I can, and they won't be submitted anywhere until I'm pretty sure there are no flaws left.
I fully expect that a QA team will find things that I overlooked.
I fully expect that a package might be rejected for commercial reasons. So what? I'll just shelve it until the market for that kind of item is better.

Want to make a nice buck as a merchant? Then you just have to work for it. Make things that customers want. Make things that others do not make. And most of all, make high quality stuff.

I'm a customer too. And I only buy things that I can't make myself AND that I can use over and over again.
If there was more strand-based hair at the store, I'd buy.
If there were more high-quality environment sets at the store, I'd buy.
But the umpteenth V4 dial-spun character with a standard skin texture map, and 20 flood-filled lip and nail colors? No thanks, I'll pass.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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