True, I'm not using those services. I'd heard bad things about Gumroad for other reasons, and Leanpub has never crossed my radar until now. DriveThruRPG is my other major storefront, which is the one I was referring to in the original post; if someone tweets me that they bought my game there, it's already in my available balance by the time I've pointed my browser there, and I can hit a button to get my money sent to PayPal instantaneously.
That makes me wonder why other platforms aren't apparently able (or willing?) to provide that level of responsiveness.