there is high demand in the QB market. we knew this. Bills are not "overpaying" for Tyrod. If anything, they are getting Tyrod at BELOW market value and they should just pull the trigger on the option already.
Is it "too much" money for Tyrod? Probably. But it's not an overpay because the market is extremely bloated.
Unless the Bills are planning to tank, then go ahead and start some crappy QB.