i think mostly because the parts are so available from engine to interior we just can't help ourselves.
i salvaged the 89 crx dash and center console into my 91 hatch after steve told me it was possible and helped me install it
look at any engine that has been out or comes out, honda uses so much of the same design in bolt patterns or what have you and bam, we frankenstein the hell out of it, even if a minor modification is needed
then there is just the natural disorder of upgrade disorder that every car girl/guy just seems to have
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
http://www.flickr.com/photos/8341770@N07/5601083432/http://www.flickr.com/photos/8341770@N07/5601083432/ by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production