I've bought two bikes through our company's scheme. One is a carbon road bike, the other a singlespeed CX bike. I use both for commuting, and considerably more than 50% of my annual mileage is commuting - of the 6400km I've ridden this year, 4700km has been commuting. About 500 of that 6400km has been done on my Brompton, which I didn't buy through the scheme. Which bike I take out of the garage in the morning depends on a range of factors but I'm glad to have a range of different bikes to suit different circumstances and I consider myself lucky to be able to have that choice.
I don't feel the need to morally justify taking advantage of a tax benefit. I'm happy to pay tax on the whole. I strongly believe in the principle of general taxation to pay for public services whether or not I personally benefit from those services. But if there's a tax benefit I can legally take advantage of, I will do so. I have a company pension too. I have a wife and son to support so can't afford to put myself out of pocket on principle.
If we're genuinely worried about people who really need tax benefits suffering through the selfish actions of others, we could be frying some far bigger fish than people who take advantage of cycle to work schemes. I'm not bothered about people who exploit the scheme to bring themselves inside tax thresholds or buy a bike for their wife. In the grand scheme of things, they aren't the problem.
d.