Payment processor join forms - custom or stock?

[deltav]

This is mostly a question for niche and/or small-to-medium paysite owners...

I have custom CCBill signup forms at my vintage paysite - the header & stylings are similar to the rest of the site's design, the form itself is simple & clean. The goal obviously being to offer the surfer a unified visual experience from landing thru the signup process, rather than springing a generic signup form on them when it comes time to whip out their credit card. You'd think it'd improve conversions, seems pretty cut & dry.

But for me it doesn't. My conversions are substantially better using the generic CCBill signup form, which to my eyes looks ugly & dated. I'm talking *much* better. I recently switched back this generic form for now, while I figure out the next step forward.

Is this a credibility thing? Are surfers still reluctant to give their payment info to a random adult site, but this ugly-ass 1999 style CCBill form somehow seems more legit? My custom form still clearly explains it's CCBill doing the transaction, looks much much better to the eye, so this sales difference is very strange to me.

I've noticed a lot of the bigger and more well-known sites have custom forms all the way thru - but maybe this is because they're trusted brands.

But many smaller sites still go the generic route - makes me think they had the same experience I did. Anyone concur? Other thoughts?

BTW - just looking for general ideas on custom vs stock forms, don't need to hear how CCBill sucks, or Sliiing & Netbilling hawking their products, etc.