Not much hassle is it? It would be highly unusual (never done this in quite a few hundred K of driving) to have more than 2 fitted at the same time. And ive never had a car where i cant transport 2 tyres quite easily.I mean it seems a lot of hassle to buy them online and have them delivered. Then cart them to your garage, pay for fitting. But i guess if you can make a decent saving it worth it.
Might not be for all of us though.