Personally, as I work as a gate agent on for AA in CMH, I'd try to avoid pulling non-revs off the plane. Thats why I clear them last if a flight is full, and wait till all revenue pax ar boarded before BP are given out. Unfortunatelly on rare occasion I have had to pull non-revs off the plane...
When it seating asignments, I always try to give the best possible seating to non-revs, however, revenue pax always have priority and the non-revs can get stuck in 32E ir etc... Hey, I've been there myself
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Thankfully, I have never been pulled off the plane myself, although it's a little tense everytime till' the door closes and the bridge is off., and you can finally chill out...
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