I love my friend's vbs a lot that they go "eww no" or something similar when I praise them a lot X) One friend in particular really hates it when we praise her utau (mostly me because I'm such a good friend ^o^) to the point that she "disowned" her utau (not literally but you know XD)
For a reverse situation:
When I put my daughter up for beta testing, less than an hour later, someone wanted to beta testing her a lot that his syntax could be considered "creepy" (all in caps and misspelled like he was spazzing out).
What did I think of his message? I WAS SO HAPPY I FREAKED OUT TOO AAAAAAAAAAA
I can't speak for all users, but I think why some users may feel bothered by constant praise may be because of low self-esteem thus they feel like the praise is faked/with meaningless words or are not used to hearing praise. Or they're just really being spammed - that's a somewhat different issue since hearing constant praise will seem empty and fake :/