I've always felt guilty by taking for granted the rare breed of virtuous humans that provide free excellent software without relying on advertising. Let's change that and pay, how much would I “lose” anyway?
It's quite sad to see reasonably popular apps with virtually no funding. I feel like highlighting the case of rssguard, probably one of the most popular apps in its category, with patreon, liberapay, and offering to prioritize bugs and suggestions from donors... barely 5€ per month.
Oh, I almost forgot, in these topics there should be a mandatory mention of core-js case.