Question:
Considering that these third party do not pay any royalties, credits, or homages to neither LEGO or MARVEL/DC/whatever, don't you feel that it is ethically wrong to buy such minifigures?
-Absolutely, I believe it's ethically wrong to purchase unlicensed minifigures. I must be living under a rock, because I don't even know where such items would be sold. I only purchase from TLG or BrickLink, and on rare occasion from a vendor at an AFOL fair.