Adult All Sites

Yesterday I just renewed my membership on upskirtjerk.
I was able to pay by giropay, and it was even possible to pay using S€PA. That's great, because I don't have a credit card.
Then I thought about an all-sites-membership, but there was just credit card as a payment method.
So I'm wondering now, why is upskirtjerk the only site with more methods? Or in other words: Will there ever be more methods for your other sites?

Thanks for the feedback, i will look into it and see if we can get the other sign up forms changed to the same as USJ.

The new forms will be updated this coming week, the options available on USJ will be then available on the other sites, thanks.