I'm not so sure. If half of the value of the app you are developing is that it will still work 5 years after your consulting gig with no intervention, then it's hard to fault someone for choosing IE.
With chrome (and now firefox?) you kind of are obliged to update... Right? Due to their update scheme I've at least gotten the impression that they won't fix security issues in older versions, but I could be wrong.
I haven't heard of any similar program from Chrome.