Are any of you folks reselling?

I have several clients and Ive considered becoming an authorized reseller for hosting and collecting extra money from the clients and pocketing the difference.

Ive never done this before, I always setup their sites and billing through big hosting companies and their credit cards get billed every month, or anually depending on how they set it up.

I was just curious for those of you who are doing it, is it worth the pain of trying to get customers to pay on time and how did you handle credit card payments or do you just make them pay for a year up front?

If anyone has words of wisdom or advice I'd appreciate suggestions. Thanks!