I got an offer from a guy from India, saying he would pay 50% of what my domain - a dot com of course! - was listed at. I responded and clarified, okay the domain is listed for XXXX (very high four figures) what exactly is your offer?
He responded with actually higher than 50% and XXXX. Since the full price is at Afternic where I would have to pay 20% commission, and his offer was direct and net to me, after a bit of back and forth discussion with him, I decided to sell the domain to him, and accepted his exact offer the next morning.
The buyer is legit, he owns a number of domains, and holds some trademarks in India and the U.S., and runs some major traffic websites in India.
However, after I accepted the offer he said he was worried about some trademark issue in India with an Indian trademark for a different domain that he thought sounded similar to mine, which my analysis as an attorney demonstrated to him that there was no issue, but he said that he was still considering the matter, and had bought the .in instead (which, turns out he had bought the .in three weeks before he made the offer to me, so why what he did weeks before making an offer to me would matter, I don't know).
Point being, that even with legitimate people sometimes offer and acceptance do not turn into a deal (not everyone understands that an offer made is a promise to perform), let alone with the apparent jokester who is sending you this $75K offer.