When I started in RC only 7 months or so back, I coudn't really understand why people changed their cars so much, mainly from what I could see at the time due to changing seasons, so changing cars.
I suppose there's two sides to the overall discussion tho.
Side 1 is that the whole changing car thing is what helps noobs like me get into RC as at any given point you can pick up whatever kind of car you want second hand, and 9 times out of 10 for a good price.
And it's undoubtedly the 2nd hand market I feel that really maintains the overall momentum for getting poeple back into or starting off in RC
Suppose the other side of it tho could be the old wanting to experiment with cars to find the car that best suits. So when a new car comes out, some people will want to experiment so sell their current to try something new - be it to race it or just even build it.
In my seven months, I've been through some 7 off road cars, however the outcome of which is that I'm actully left with the one car that I actually like, want to keep and start racing with
Down side tho, now I've found the off roader to keep, have moved over to indoor racing and so the process begins again