Mystery machine

The Scooby Doo gang was pretty presumptuous to name their van The Mystery Machine.

I realize that they encountered an uncanny and irrational number of criminals trying to cover up crimes by using the ghost story and costume, but still, did they really expect it to continue week after week?

Who could assume that after encountering a fake Yeti on a ski trip and a two-million-year-old caveman while out fishing, similar encounters would happen again and again and again? 

It seems fairly irrational. 

For 41 episodes in the first iteration of the show and hundreds more thereafter.  

Presumptuous, I say. 

Also (and this might be nitpicking), but if you own a van, why the hell is everyone always sitting in the front seat?