If you star tweets that are funny (like most of my users do) then there’s no point in removing stars*. It doesn’t help anyone - and makes it impossible for favstar to collect them if it hasn’t already.
If stars you ‘know’ should be there haven’t appeared next to a tweet on favstar.fm, first check on twitter.com that the tweet hasn’t been deleted from twitter**, and then check the star hasn’t been removed from twitter.com. If you think there’s a bug with missing stars, do let me know and I might investigate - but please check these two things first.
If you know someone that removes stars thinking it will get more counted, or somehow benefit them in some other way, please let them know it’s not the case.
I invite you to reblog or tweet a link to this if you’re a regular favstar user.
* On the other hand, if you star tweets for bookmark purposes only, and you’re done with the bookmark - it makes sense to remove the star if you don’t care about it showing on favstar.
** Some users delete tweets if they discover a typo, if they decide they don’t like it, if they want their tweet history to be clean of replies, or for a myriad of other reasons. Perhaps I should also warn that favstar might get confused about you if you delete 50+ tweets at a time. Deleting 1 or 2 tweets at a time is fine.