I'm genuinely impressed by the author's willingness to come up with such a silly idea, go through with it, implement a completely barebones website that won't even let you send emails from the addresses and starts selling subscriptions for $10/year. I'm not being snarky, I'm genuinely impressed. If it were me I'd spend 2 years mulling about it and never actually do it because I'd be worried about not managing to make…
I'll take "things you can do when you're single"... can't quite imagine sidling up to significant other with the gambit "Darling, would you mind terribly if I spent £1000 on Kazakhstani emoji domains?"
This isn't about relationship status, the author of this post just has money to burn.
And even if the author expected to get their money back through paid sales...they're on the hook for those accounts now unless he personally writes it off.