After further thought, it seems like having a reputation as difficult to hire for and a reputation for attracting smart people would be two very good reasons for people "only in it for money" to learn Haskell.
Not sure why you were downvoted here, I agree with you on this. The only thing is that there aren't a lot of Haskell jobs out there, and that is a far stronger signal to people looking to jump into the software industry than the nuanced opinions of industry veterans in forums like HN.
No, but actually bothering to learn something that isn't what is being shoveled through most major outlets is at least somewhat correlated with motivation.