How many times have you had to provide an answer, verbal or written, as to what these arbitrary and meaningless prefixes mean? Add up that time, and then multiply that by your salary. These poor practices cost an awful lot of money.
They are obviously not arbitrary or meaningless. If I had said klw for my OLAP and xdr for my staging areas, that would be arbitrary and meaningless. Far enough point on the sa also being system administrator, but lots of abbreviations have multiple meanings.
I've never had to explain them beyond the explanation I gave above. So I would say, all in all, it's very little money. In any case, I'm not trying to convince anyone to change their names to what I think they should be. I'm personally just glad to know that people have naming conventions and use them. I've worked in both environments, and an environment lacking such conventions is harder.