A dollar saved is always easier to come by than a dollar earned. Very many companies start to spend their hard earned money foolishely once they become big or get funded. You should always treat the companys money as your own, or you shouldn't be allowed to make monetary decisions.

I always look to IKEAs founder Ingvar Kamprad for inspiration in these matters. He still buys schampoo in discount stores even though he is one of the richest people in the world (he doesn't show up in a lot of lists since his wealth is in funds and not in his name).