Your words makes my mouth watery. This is a great deal, I've often been playing around those create new account options, well, that was when I tried referring a friend it turned out they were out of accounts to claim. It resulted in us using ecency for the creation.
I'm still not quite conversant with how all this works, but it's obvious that a great deal of the block space survival relies on the RCs.
Time for digging deep ;)
The RCs are needed for each transaction. For example (I don't know the actual prices) transferring funds might be 1000 RCs, leaving a comment 2000 RCs, adding a top-level post 3000 RCs. Once spent, these replenish like voting power does - but it means that if there isn't enough RCs, an account can't spam - though it doesn't take much - 50-100 HP is probably enough for most people to do most of what they normally do