For me,
<UL>
<LI>Free content of significant amount (5000+ pics).
<LI>Paysites look like they will convert.
<LI>Can get to the signup page without being told my multiple valid email addies are invalid (20%-40% of paysites are like this at the moment)
<LI>Payment by Paypal or Epassport (I hate checks, since I move every couple years, annoying to update all those addies)
<LI>Random Prizes for doing certain # of sales or rebills in a month. Cash, or small prizes.
<LI>Support that doesn't ask me what a FPA means.
</ul>
ZoiNk