I have close to 85,000 miles on my GTS and lift is as strong as it's always been. I'm going to replace them soon. Just like any other maintenance on my car. I believe it's time and I don't believe the bolts have to be replaced every 15,000-30,000 miles or whatever. If you think they do then maybe you should worry about other things on your engine if you are pushing it that hard all the time.
I beat on my car and my lift is still golden and brings a smile to my face.
Remember I drive a GTS and beat on it probably before most here. So I have an idea how others could break the bolts, wear out the clutch prematurely, blow engines, bent valves, blown transmissions, bad synchros, etc. It's mainly due to driver error, inexperience, and neglect and over abuse over time.
You drive hard expext to pay to get it fixed and don't blame Toyota and their engineers. Just pray you are still under warranty.