I haven't had your experience. But the cost of labor is high; I don't think the store was trying to push you into buying a new camera. It's just the reality of having to pay for skilled technicians to diagnose and repair complex electronic hardware. Maybe you'll get lucky though, and the tech will find that it's something incredibly simple and wave any charge*. Good luck.
*I'm a technician in another field, and if I find a very simple solution, it is what I do.
I have received excellent performance from my G9 since buying it 2+ years ago. However, a month ago, under no remarkable circumstances, it would no longer power up, and it was not a battery issue. I took it to the camera store I bought it from and was told to pay $25 to send it to Canon, and expect a charge of $225 if it is fixable. That last part, $225, seems arbitrary and possibly designed to push me into a newer model. I have had a string of Canon cameras and liked them all, but now I'm waiting 4-6 weeks to be told the news, which I suspect I already know.
Anyone else have experience or a feel for what is likely to happen next?