I've used my JetBoil every morning and most evenings the last couple of years (nearly 100 nights of camping) and have never had a problem
I just turn the gas up a little, push the button and presto!
Sounds like some quality control issues at JetBoil.
Wow, wanna trade?

I've replaced the unit, but the new ignition isn't any better. It too failed after a few weeks and is now as dead as a door nail.

I've read that MSR originally designed their new Reactor stove with a piezo ignition but then removed it because it was unreliable.
Apparently, Jetboil is aware that they have a problem; the new Jetboil is advertised as having an "improved" piezo ignition. I've heard mixed reports as to how good the "improved" ignition on the new Jetboil is, but on the older Jetboil, yours is the first report I've ever heard that indicates that the ignition is reliable.
HJ