I've been using the same 32QT aluminum pot for years. Started out life as my boil kettle, then I put a 4,500w element in it, and it became my electric boil kettle. These days it's my electric HLT. It's still trucking along. Stainless fittings, and no signs of corrosion yet.
The entire pot acts as a sacrificial anode if you use it with an electric element. In theory, the entire pot will eventually wear out. It could be decades before that happens, and if it ever does, it was only a $22 pot.
If you are using propane, my setup is a worst-case scenario by comparison, and I've had zero issues. Carry on =)