Well, sometimes planes are more likely to break due to their location. For example, if you land in Miami, Daytona, Cancun, etc. planes are much more likely to breakdown than po-dunk Oklahoma, or Wendover Utah. (don't rag on me, I've lived in both states and liked them both).
That being said, the company I work for carries spare starter generators in some of the aircraft we fly. The notion is that it's better to have the parts on hand for an easy swap than to have the airplane grounded in an obscure location.
It hasn't happened to me, but yes, starter problems seems to be one of the more common failure modes for turbine aircraft.
.. I think the Westwind has TFE331s...our planes don't..
I don't like to be fueled by anger, I don't like to be fooled by lust...