Most racers in LFS drive the same combo every night because satisfying their own ego is a key factor in having fun. Being beaten by other racers makes them feel bad, but being beaten by their own car completely floors them.
Check out the Dead Men Racing server, they change to a new combo every week and often run the less-popular "drivers cars" like the LRFs or the LX4. Plus the server operators and the regular visitors are among the nicest people you'll meet in LFS.