Did you grease up the threads? You gotta grease those threads and then thread the crank puller in deep before you start to torque it. I have stripped those threads before, luckily it wasn't on a $300 crank.
Anyways, crank pullers suck. I hate using them.
I have a complete set of silver Sugino 75 cranks if you have a nice, black crankset for trade??
Also, I agree it can be very dangerous to ride around waiting for it to loosen. I rounded out the inside of my crankarm taper doing that. I don't think there's really another way to get it off, though. The good news is that you will round out the inside of the crank arm LONG BEFORE you round out your BB spindle. So, if that crank arm is already toast, then it might not be that bad. Just make sure you're running a brake.