Net10 bad idea

In my case,I did not use the Net 10 phone very much, so my time ran out while I still had 280 minutes. Their cheapest extension card was $30 and if I recall correctly they start you out with a phone and 300 minutes for $30. So, just to get on the air again takes another $30.
I wonder if anyone at net 10 has thought this out? I'm not going to use the phone at that rate. I think they will wind up with a lot of one-time customers. It seems to me very stupid.