We have our own internal micropayment system -- each customer has his own wallet and buys cam shows at varying costs. e.g.; cam credits per minute.

There are and have been companies that offered "wallets." One that I remember offered micro payments for porn.

I forget their name now, it was 5 years ago ...

This is an easy idea to implement but so far no one has succeeded in marketing the service -- several people have already tried this and failed ...

You cannot run small transactions through processors and VISA-Net -- the transaction charges would kill your profit -- you need to "load" a wallet and make the purchase from that.