I was in a Massacre CTF. We were losing 4 or 5-0. When the battle finished, only the winning team got crystals. Everyone on my team didn't (at least I didn't) get any crystals. The scoreboard did not show any value of crystals next to my team's names. It didn't even say "0", it was just blank. I'm pretty sure that every player gets crystals as long as they have a score greater then 0 (which all if not most of my team did).
Customer support service by UserEcho