Age of "new" tires

Just my 2 cents...

Let's say you take the chance and run old tires, now let's say your driving 65 to 70 on the interstate and a tire let's go. Assuming you keep it on the road and upright you are looking at minimum, of a tornup fender. There is $2,000 to $3,000 in repairs minimum. Was 500.00 in tires every 7 years all that expensive?