um, bcos we find it interesting?
then u ask, why interesting?
then why do stamp collectors find stamps interesting?
cos got variety, some blue, some red, some green. and some are rare
and worth alot.
then i say bus also liddat lor. got different types of bus, some
the engine sound very unique, some the bodywork very nice, some the
engine very powerful etc. different people got their
favourite.
but u say stamp collector so common wat, bus fan not that
many.
then what about, erm, handphone enthusiasts? i believe there are
such people out there.
basically, if u see or experience something on a regular basis, u
can develop a affinity to it. though the chance is not high, if not
everyone living in sufficiently urbanised areas (ie with public
transport eg buses) will become bus enthusiasts.
so wat is it that leads to this affinity developing in bus
fans?
then ask urself: wat about stamp collectors? can u say what makes
them interested in stamps? or muggers? wat makes them so interested
in studying? or handphone enthusiasts? nature enthusiasts?
such things are very subjective. different people have different
preferences. this preference leads to a liking, and maybe
eventually a fanatism.
not just for bus fans, for enthusiasts of any kind.