Crazy money for that rental though. The Audi RS models have traditionally depreciated very slowly. The cheapest RS3 on AUC has only depreciated around £10k in 3 years / 30,000 miles (sure, trade prices will be lower, but not by as much as leasing will cost, by a long way).
If you are going to buy an Audi RS, then generally you do it so that you can take the equity out at the end. So either buy it outright, or PCP. There are a few cases like this out there, Ford RS models are like this too. You would be stupid to lease one of these cars, as while the monthly payments might be similar to PCP's, the residual values fo these cars is most often very good.