I have started doing pretty much the same thing a couple of years ago, but I'm on like my third 0% card now, with all the others still open but sitting in a drawer.
I'm a bit confused if I should start closing them or not. All advice I see seems to be you shouldn't close credit cards ever,, but there are only so many lenders providing 0% cards before you come across the ones with weird requirements or unheard-of companies I'd rather not deal with (I remember M&S wanting written references from 2 people, or something to that effect?!).
Once I've done the rounds with all the major banks, surely I can't open up a second CC with one provider if I've still got an old, previously 0% card still open with them? Or can I?
If you just end up endlessly doing this, do you end up with a drawer full of old credit cards after a few decades?!