Ah yes, let me just whip out my wallet real quick and pay for a demo of an HTML file. I'll _definitely_ be doing that.
To be fair it's a great way to accept donations.
It's not a donation if they're actually selling a file.
Maybe we have a different definition of "donation", but it requires you to pay at least $2.50 to access it. Sounds like a purchase, not a donation. And for a demo of an HTML document.