Expensive, yeah. It should be free, actually; my whole gripe is that I don't want to pay to receive messages I didn't even want. It doesn't help if I have to pa

Expensive, yeah. It should be free, actually; my whole gripe is that I don't want to pay to receive messages I didn't even want. It doesn't help if I have to pay not to receive them. But it does sound useful. And if it gets mindshare, competition could make it cheaper or free.