I don't know how much one of these tyres costs but I would hazard a guess at approaching $800 per tyre. Motor racing is an expensive business.
At the Le Mans 24 hours there is a whole huge paddock devoted to the tyre supplier's trucks and for the whole 24 hours teams are shuttling back and forth with tyres.
For 2017 Formula 1 goes back to big fat tyres. Hooray. Real racing cars should make a lot of noise and have big fat tyres. This wonderful shot below from my archive taken at the Italian Grand Prix at Monza in 1981 shows how it used to be.