I’d be on the fence about the frame. The price point is good considering its a 2013 kart, but that frame has been raced hard to get that amount of flat-spotting in a single season. If it were me, that amount of flat spotting would bother me. But again, a 2013 Tony Kart is going carry some value regardless. In the end its up to you, But I think you can find an older kart in much better shape for the same – if not less money. $2500 to $3000 can buy a nice used kart if you’re patient and look hard enough.
I’d also listen to guys about buying a kart serviced by your local track. And also about buying one already set-up for the engine class you intend to run.