That seems excessive for 7 months! I have the same frame and the same machine. I bought it 3 years used and just replaced my tracks. I called the Grace company and instead of ordering new ones, they suggested I cut the short ones down since I did not plan to use them. Otherwise I could have ordered them, don't recall the cost, but it was too much. Good Luck with the LQS.
When I called Grace they suggested that I clean the wheels and track often, but some wear and tear was normal.