Hi, there's a couple of things about your website usability that I think could be causing problems:
1) Too much text - you should look at halving it at least. Users only skim read so you need to make it easy for them. It needs to be cut right down as it's just off putting.
2) Overall your website has a very "busy" look, you need more white space to make the important features stand out.
3) Navigation headings are unclear - are "coins" and "custom coins" the same thing - if so, why do they have different names?
4) Spelling! It's such an easy thing to fix but looks so unprofessional e.g. "beast" on home page under Q&A should read "best".
Sorry to sound negative, I do like the fact that you have images of items you're selling immediately visible, but I think there's a lot you could do to improve your site,
hope this helps