This is one of the most fuckin intelligent questions out there:
I've been in the biz for a lil over a year and I just changed my pricing. Last year, I charged $7.95 for 7 days and $19.95 per month. Just 3 months ago, I changed my price to $7.95 for 3 days and $24.95 per mth and I noticed a fatter check! If you've got quality content and a good design, members will pay!!
Another thing is to offer as many billing options as possible. I use ccbill (credit card billing) ibill (900# billing) and money orders. Believe it or not, I get a few money orders

The only thing that sucks about M/O is that it's usually for 1mth or a trial (waste of time)
I hope this helps. Good luck!