Yep, the trash approach worked with my son up until he got wise to us a couple years ago. Now computer time works with him. You don't listen, you don't go on line. Every time I have to tell him to do something, that's 10 minutes computer time lost. That's quite a chunk of time when he only gets an hour. He pushed and lost ALL of his computer time about 3 times before he finally realized we weren't playing around.
We tried to play the trash card with Olivia but she just said, "That's a lot of money to just throw away like that, Mommy."
Usually time out works the best with her. She has her days though, like today, where nothing seems to work and everything just seems to make it worse.