Because apart from the popup you eventually unconsciously dismiss every x number of saves, there's no reason to pay up. I've been using it for 4 years unpaid,

Because apart from the popup you eventually unconsciously dismiss every x number of saves, there's no reason to pay up. I've been using it for 4 years unpaid, sublime has helped me get my first home. If I was forced to tomorrow because I could no longer use it I'd pay for it immediately, but right now there's nothing pushing me to part with my cash.