It would just unnecessarily toughen up weak monsters that are easy to kill safespotted (like blue dragons), while difficulty of stuff like corp wouldn't really budge and that's kinda unfair imo
Doubt they would sell for a lot, as it'll probably have a higher price than a regular account with the same stats, so it could only be for bragging. On the other hand, ppl still pay 1k$ for some skins on cs:go, so you may never know lol