What? They pay state, local (if any), and fed income taxes (assuming they earn enough to be taxed) and sales tax. They also pay property taxes if a homeowner. Also, most cyclists also own cars, and therefore are subject to registration and other car-buying fees like anyone else. Same for gas. They just maybe - if they cycle for their commute, errands, etc. - use the major roads that their taxes pay for less than car commuters. In addition, in many states the registration/ title/ license/ plates fees go primarily to pay for the DMV organization itself; some states also use it for road/ infrastructure upkeep - so in many places not paying purchase/ registration fees doesn't impact the roads, anyway.
Further, if you have trails, which improve community QOL in general, if they are open to bikes, they are almost always multi-use - for cyclists, walkers, joggers, Rollerbladers/ rollerskaters (if paved), and in some places, skiers in the winter (unpaved). None of whom pay per use (in most areas).