Sorry, didn't see your question. It's exactly as stated . . . my statement was the gem expectation. Instead of a couple people spending thousands of gems, we ask that each individual on the team spend around 300 gems. I think that's reasonable for a R4 monster. A regular monster doing progressive would cost you 140-150 gems.
Even for f2p, it's still doable. Dungeon (easy and hard) gives you about 160, gold, feeding etc gives you 20 per. Plus, if you have a larger account, you can easily get 25 gems from gold, runes etc for placing in the top 5000.
Races come every 3 weeks or so, so that means you should have quite a bit saved up. Definitely enough to help the team out.