Bobby @ Making Money Fast and Slow said:
The problem is once you have too many credit cards and they become unmanageable because you have to keep picking the right one out of your wallet. I was going crazy with sign-up bonuses for a while, but then I calmed down and stick to just a few cards now.
I list most of rewards cards here.
Hah! I've got a spreadsheet for that. Lists all the deets, and we're usually only working on 2 cards at a time, so no headache there.
But yeah, if you don't have a tracking system, can get to be a bit much. I advise people to only churn 2 at a time to start, you can get a a good week-long vacation out of that :)