Why is it any more expensive? Used wheels are cheap and changing 4 with the jack and wrench in your trunk is like 30 minutes work tops, less if you have a few bucks for a floor jack, breaker bar, and torque wrench. Tire wise, you only drive on the summers in the summer and the winters in the winter so it's not like you're magically ever wearing out two sets at once.
So with a spare set of wheels you could easily re-sell for what you pay for em and two sets of tires you won't wear any faster than a single set of all seasons, you're really not looking at substantially more money for two separate sets. Changing tires twice a year is less work than an oil change.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD