That is quite a few days of all-night sex.
Since gf and wives are lower value than a prostitute (which would be equal to 1-2 hours).
Better off buying it yourself by prostituting, than the uncertainty of convincing the guy to drop $800 on the toy.
Which was the reason my little brother dumped his previous gf, she's a fat shut-in slob and relied on him to take care of everything, he worked 3 jobs and did car repair on the side, ending up in the hospital multiple times due to overwork, stress, and her lack of support. Bills didn't get paid, debt piled on him... she spent $900 on BJD during one of his hospital stays. Dumped the fucking cunt when he got back and found out.