Mine are, I got them done. For me, momentary discomfort (and it really didnt seem that painful for them, and didnt stress them out) and £20 per bun is well worth it to return them to me if they were lost. With a cat or dog you have the collar, with a rabbit you have nothing unless you chip them. If they were to stay indoor buns I may not have gotten it done, but I got it done as I knew they would be going into boarding and at some point in the future they may be outside buns.
I got it done for the same reason I get vaccs done - better safe than sorry, and better a small amount of discomfort to prevent a bigger problem later.