Of course. Are you saying all programmers run ad blockers? Just visit any [usually divisive] ad blocking Hacker News post and you'll see people who aren't blocking ads. Chances of none of them being developers is slim. Also I don't block ads. So that's one.
Of course. I know even more who whitelist sites with ads that aren't overbearing.
I have a hard time believing anybody actually goes "lemme turn off ads on this site to see how they are."
It's just something people say they do online to feel good.