I always sweep the money into my bank account. I don't even use it if I'm about to pay for something with Paypal; I take it out first and pay for whatever I'm buying with a credit card transfer back into Paypal.
I do that so that the amounts hitting my bank account match the amounts I was paid by the MSC. At the end of the year I reconcile every shop to my Quicken file (I found a missed PayQuicker amount last year that was slowly being eaten by "inactive account" fees).
It gets confusing when I have a credit card amount of $15 when the purchase was $25 because it used $10 that was in the PP account from a bank shop. I don't want to have to look in two places for the purchase if I need to find it for some reason.
But I'm an accountant and we can tend to be anal about stuff like that.
Time to build a bigger bridge.