I don't know enough either myself so what I have stated is my opinion and I personally choose not to as I don't know what damage is being done, and at the end of the day, if they had worms, surely I'd know about it- weightloss, diarrhoea, lethary etc.
There is a lot of controversy even over worming dogs and cats, and many have decided not to as the stuff is strong enough to kill worms so what is it doing to pets on the inside?
The vast majority of pet rabbits are not wormed, and I am sure if there was a even a small occurance of rabbits needing to be wormed, we'd have heard about it long before now by greedy manufacturers.