To each his own is a good rule when it comes to hacking/geek projects.

I've so often been asked "but why are you doing this" or suggested that I go and buy the stuff that I'm making.

I find it very annoying. I find most people who ask so such questions won't "get it" even if I explain.

But I do understand that most often people are trying to be helpful. They can't imagine going through the ordeal that I'm going through for something of no value to them.