why not
because it doesn't make any sense to include them
Because it forces the film makers to think on their feet and and creative, but effective solutions that otherwise could be solves by just throwing money at it. And the overall feel, the charm of low budget films is something that can only get with having a lower budget.
that's the most ridiculous thing I've ever heard. if you find some way to give your $20k ford fusion some of the features of a $100k mercedes S-class, it's not gonna be better than one
and what "charm"?