I'm still using the solid brass one that was left to me by my grandfather in 1983. I lose it from time to time, but it always turns up. (unlike combs, socks or biros!)
If you have radiators that often need bleeding you either have an air leak (Oxygen into the system tends to induce corrosion) or you have plain corrosion and it's hydrogen building up. You may want to find the cause.
Andy