Materials have gone up. But there are other costs involved than just raw materials. Transport, bought expert services (electrician, etc), tool wear, ...
> Personally I learned to interact with people in a nice way
Good for you. I think some people can't learn that, at least without some sort of a therapy.
I friend of mine really struggles with filtering what he says to other people. He doesn't want to be like that I think, at least he has regrets of how he's behaved. But it doesn't really improve.
https://en.m.wikipedia.org/wiki/F._D._C._Willard