Ziggie - I'm not a merchant, nor much of a Poser artist; my opinion may thus hold little weight! But I don't think there's a "price of admission" to sell things in the marketplace. Thus ANY sales would be to your benefit!!
Did you ENJOY making these items, for yourself and others to see (and possibly purchase?) If so, then you're ALREADY successful. You advanced your modelling knowledge AND had fun doing it!!! As one gets older (I'm 52), one appreciates the notion that the "journey" is often more important than some (artificial) goal.
Keep up the good work and ENJOY yourself! - Ray