Just reread your post? Are you dabbling in the ceramics? If you are in collectibles, is it possible you are buying less desirable pieces because of your limited budget?

From my armchair (is. I have zero credibility), I am thinking it is a mistake to pick a niche because you like it ... Unless this is a hobby. If you want to make money, you have to find a niche were there is demand and spending AND you can afford to get into the game.