According to their own website, 130.103 creators together earned over $747.716.634 on Gumroad.
Sounds amazing right?
Well, Gumroad has been out there for about 11 years.
($747.716.634 / 130.103) / 11 = $522.47.
Gumroad takes a 10% fee as well, so that's actually $470.22.
The average Gumroader has made about $470.22 on average per year.
I mean, not bad, but not exactly great either?
You can make that much and more by selling old stuff every year on ebay/Craigslist/...
Is anybody actually making significant money on Gumroad - apart from perhaps the top 0.5% of users or so who actually may be making 5 or more figures a year?
Let's consider 2 possible alternative scenarios:
I) 80% of creators are making 20% of the money, but the other 20% are rather successful, making 80% of the money. Thus, if you are at least among the top 20%, you will make, on average, per year, about
(0.8747.716.634 / 0.2130.103 / 11 * 0.9 = $1880,87
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II) 80% of creators are actually idle, making 0% of the money. All of it goes to the 20% of active creators. Thus, each of them would be making, on average, per year, about
$1880,87 / 0.8 = $2351,09
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Maybe these scenarios are closer to reality for actual creators on the platform. But even then, it's not amazing sums for a whole year. For some, it wouldn't even cover a single monthly rent. Then again, for others this might be enough to cover several of months of living costs.
You mentioned eBay as an example. I bet 99% of ebay users have made less than $100 selling on eBay, but eBay is still a huge successful platform.
Same for GumRoad I'm sure.
Moral of the story: don't skimp on error messages and make sure your CAPTCHA actually works if you really need it.