Agreed with OP on HoloPoint and other apps (e.g. AudioShield is another favorite of mine) being a surprisingly intense workout. I sweat quite a bit with these games after ~15min, and this is definitely a problem. On Vive, the soft padding absorbs the sweat from my forehead as a sponge and becomes quite gross. I've learned to deal with the yucky feeling and can mostly ignore it, but I could see how others wouldn't.
One solution is to buy something called "3d sleep mask" costs $7 or so on Amazon but you can get them for less than $1 on Aliexpress with free shipping. Then you just cut out the middle part and the headband.
They won't be quite as soft as the normal ones since they are thinner but the advantage of this is that it increases FOV since you are closer to the screen. In my experience they also stick quite well to the Vive.
I own an Oculus Rift and find that you only really get sweaty with very physically active games (AudioShield, Space Pirate Trainer, etc.). When it starts getting sweaty I'll usually just go do something else for a few minutes until it dries.
