whosatthewheel, walking hurts, riding doesn't. Consequentially I don't like walking when I can avoid it e.g. I tend not to ride fixed on routes that I know will require walking. There are plenty of 1000km brevets and I'll tend to ride the ones that let me ride, rather than walk. The OP asked whether requiring walking would put people off. That would tend to put me off but not invariably so.