There's also been plenty of valid criticism here as well...

"Hacker News hated Dropbox so..." Is a fun trope, but Dropbox still isn't profitable ;)

In seriousness I bet a lot of us go though the thought process that we want to give constructive criticism, since positive feedback isn't super actionable.

Feeling smarter than the rich people is always a good feeling too (and cheap, since we aren't even betting our own money )