What complexity and hardware costs are you referring to? You need to have a decent graphics card, which most PC gamers do, and connecting the headset is just plugging in the cables into the PC (HDMI and USB for ours)
There are a lot of us tech enthusiasts who just have one laptop for business/research, zero or one not-current-gen games consoles and maybe a sorry looking ancient desktop. This makes the Quest an attractive and unique new treat to drop a couple hundred GBP on, obviously less so now.