I'm not sure whether all cyclists are inveterate bodgers and fettlers, but I certainly am.
I'm still slightly cross with myself for buying wheels that have proprietary spokes (although they are VERY nice wheels) as they can't be fixed up with bits I can pick up easily and cheaply.
There's a satisfaction in fixing things, and in extending their useful life. As bikes are, mechanically, generally fairly simple, they're ideal for this approach.
 Internally geared hubs exempted.