Well it obviously has a negative effect but the reports are giving me 10 crashes per day and there are 100 more uninstalls so even if 1 crash = 1 uninstall, why are the other 90 ppl uninstalling...
Ah, I see; I was interpreting "a few crashes per day" as "a user will see a few crashes per day", which I understand now not to be the case. That being said, the sibling comment here suggesting that some crashes might not be reported is an interesting thing to think about, although I don't know nearly enough about mobile device to know how to tell if that's happening.
How sure are you about this? Speaking personally, if I installed an app that was otherwise good but crashed that often, I'd likely uninstall it.