I invested $1,000 in Gumroad back when they did the public fundraise, and I got back ~$70 so far. At this rate it'll take multiple years to break even, much less earn a multiplier. But oh well, I liked the Gumroad team so I wasn't looking for much of a profit anyway. Related, I thought it was hilarious how so many creators on Twitter publicly stated they were leaving Gumroad when the 10% fee change was enacted, only…
Sorry, but to confirm, they charge a 10% flat fee and that's it? That's insanely good compared to every other platform I've seen for any type of commerce. Sure, Amazon, Apple, and the like also help offer exposure and some other services, but 10% flat seems completely worth it until you hit a critical mass where it makes sense to handle things yourself. I imagine that number is very high though.
Considering you'd only be paying Apple 15% (I doubt many people on Gumroad are making more than $1 million) it still seems like a relatively good deal in comparison.