A lot of health insurance won't cover injuries from a trampoline either, since it is the most hazardous thing parents get for their kids. Especially dental, when they hit the netting and pull out several teeth at a time.
My friends daughter was just jumping around and the mat hit her on the bottom of the foot wrong and snaped her shin bone right below the growth plate, the Orthopedic Doctor had never seen a break like that before. My friend had to pay a lot out of pocket for things.
Trampolines a great fun for the whole family. My 3 yr.old grandson is in a toddler type gymnastics class just so he can spend time bouncing/jumping. Just be aware of the possible complications/issues that can come from having one on your property before you spend all that money.