If a merchant is a Poser user who makes a product for use in Poser, perhaps he or she won't spend even more time testing it for Daz Studio compatibility. As it stands, a merchant is lucky to make minimum wage for the time invested in creating a product. They don't owe you anything. Daz Studio users aren't a protected class and it isn't discrimination to not cater to them.

Download my free stuff here: http://www.renderosity.com/homepage.php?page=2&userid=323368