[vadimberman]

If there is no revenue, then the offer is likely a one-off opportunity. Don't expect a bunch of prospective buyers even if you hassle their CorpDev departments or potential decision makers.

$50K is likely a guesstimated amount, not based on some kind of calculations. It's basically "looks like it might be valuable, so let's give him some figure big enough for an independent developer but not too much".

Personally, I would haggle a bit (say, try to raise it $80K, then meet around $60K-$70K) and sell. Do not underestimate the uncertainty and the amount of money that needs to be poured to monetise the business. If it's coming from a small company or a person, they are more flexible.