My head sweats a lot cycling; I wouldn't want to try and wear a VR headset while exercising.
I use silicone covers and I have a small towel on my neck. It works fine. There are other options as well.
If only Facebook didn't start their Facebook login requirement so soon. More people would actually try it out since the cost would be low enough
I think it's been somewhat of a walled garden for a long time due to price (headset + PC)... So a lot of people formed negative opinions about it before even trying it.