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Most important is the ability to pay by ePassporte, nowadays I never sign up with anyone who does not offer this.

If you have ePassporte, one thing that can not only sway me into signing up, but also make me promote your program heavily once I have signed up (rather than just a few banner ads) is if you offer a blog feed that can be incorporated into my site as content.

Thirdly (although this is mainly to get me to push your site/s harder rather than to get me to sign up in the first place) is if you have hosted galleries which come with proper descriptions as well. But I do mean proper descriptions, something that actually describes the gallery, not something generic like "hot teen lesbians at it".

Also (again to get me to promote once I have signed up) is that you should have a good selection of banners (various styles, types, and sizes). A good example of this is that AEBN work better for me than MaxCash, plus MaxCash have a hell of a lot of cross sells, and are not recurring. But MaxCash have a great selection of banners, and AEBN's selection is, quite frankly, crap (if anyone ever offers an industry award for the worst selection of banners offered by a sponsor, AEBN win hands down). So when I am looking for an extra sponsor to put in a sidebar, it is usually MaxCash not AEBN.

Finally, and any sponsor who offers this will defiantly get me using them (and no one has yet, so you could be first). I will most certainly sign up with any sponsor who promises that after I have signed up they will organise a threesome with me, Linda Blair, and Gina Gershon (British sponsors can substitute Davina McCall and/or Karen Gillan - or better still, let's make it a fivesome).