I'm using some that I've had for 10+ years. They don't go that often (although like any electrical equipment, they won't last forever).
When you say they're dying on you, what exactly happens? Do the electrics fritz? Do they overheat and the covering cracks? Do they just stop working? Do you have more than one plugged into the same socket and they all go at once?
Assuming that nothing else electrical in your home is such a pain for you, I'd think that either your thermostat/rheostat/dimmer is dodgy, or there's something in the way they're set up which is causing a problem.
For info, it isn't actually necessary to stick them to the tank. I use them inside and outside without ever sticking them down.
If you can give us some more info about how you're using them, hopefully we can come up with a few ideas so that the next one lasts longer.