I have seen some weekly and bi-weekly recurring memberships in the Mainstream.

Some of the big sites dealing with social dynamics (how to get a date) are doing upwards of $80 per month, but they do it in bi-weekly or weekly billings.

The Trick they use is to use odd numbers with this style of billing.
They don't cut the $80 into even slices, rather they'll do two or three slices of weird amounts like $23.71