Don't know if you play Tier 10 tanks at all, but when you get a platoon that decided to bring in an MS-1... or theres been games where your team gets 3 tier 10, and theirs gets 8...
Thankfully it's not THAT common.
I'm at tier 8 with my top tank, but that's an AMX 13 90, so I end up in lots of tier 12 matchups. Seen that shit happen.