For my part, I need to be very very sure when it's posted through gumroad. I've gotten burned too many times by short term (as in, within months) abandonware through the gumroad sales channel.
Dev gets bored, doesn't want to deal, download goes unavailable. So you buy it, get a new computer next month, and can't install it. Especially annoying when I "name my own price" typically around $20 to tip the dev, and then the dev won't even keep that build available.