Well, it's dirt. As such, it's cheap, kinda. It absorbs paint. It gives a good traction to the players. Non-slip by nature.
Dirt is, well, dirty.
It coats guns, goggles, players, and everything else with a thin coat of 'dust' as the day goes on. Unless you keep it damp, this dust will kick up badly. I saw players hacking and coughing between games, they had inhaled so much dust. It trashes thermal lenses, ruins barrels, and so on. Also, you'll run into 'mud' if you wet it too much.