Adding more IPAM pollers: is there a license/cost needed to for this?

I've seen the docs and forum posts address "IPAM polling is backing up" with "Just add more pollers". Can we add as many as we want for free, is there some limit before having to pay for them?  I was under the impression that for NPM (and I guess "the Orion platform, which IPAM sits on) you had to buy a license for every additional poller you wanted to run. I wasn't sure if this was true or if IPAM was an exception.

Yeah, I could ask my rep but I don't want to open myself up to anyone thinking I'm going to/need to buy licenses.