I’m the author of JSON Formatter [1] with 989,000 users.
I probably get a couple of offers a year for it. Of those that have offered specific sums, they ranged from from $10-20k. I always reject them, because it’s pretty obvious they want to turn it into malware.
I’ve had a couple of cases where I felt they went to some effort to schmooze me first, presenting themselves as having benign intentions, almost like a carefully crafted con. But as far as I can tell, there is no legitimate, ethical reason to want to acquire it, and I won’t sell out my users like that.
$20k seems like a pretty lowball offer? Close to 1M users (plus potential for further growth) and you have me expecting at least $400k... Or, am I expecting too much?
I publish an extension on the store of Chrome with 1+ million
of (technical) users. Three years ago, someone proposed me to buy it for 50,000 USD. He clearly indicated that he was interested by the user base...
I was never curious enough to read the offers, I just bin those emails. As said, this project was never about being profitable and I am already very grateful for the donations I received.