Wastage of Effort

When my friends come to me, and suggest something utterly waste of effort or money, I get quite angry and upset.  I tried my best to put them straight, but a lot of time is fruitless.

On the other hand, they don't appreciate me just saying, "do whatever you like."

To my ears, they are just saying, "burning money, burning money, wasting time, wasting time".  What do they expect me to say?

It matters less when their wastage does not affect me.  Or I really don't care for them that much.