I force mine every year, some with the old traditional forcers, and some of the bigger crowns with those big black plastic composter things.
I only harvest the rhubarb for around half the year, and I get lbs and lbs. (don't like rhubarb that much so give it pretty well all away) Then I take off the forcers and let it grow unmolested for the rest of the year.
I should feed it but mostly forget so it gets a few handfuls of seaweed meal some years and then grass clippings round it to hold the weeds down. You can have say 4 crown and force 2 every other year, but my problem is keeping the stuff in check.
You do have to watch for slugs if you use a forcer but they are not too much of a problem. And some years mice can be troublesome, but not often.