There were some posts saying that on these forums in the early days when Citi bikes just came out, hard to locate the posts now. But I can understand that. For one thing, imagine people hauling gallons of water and other heavy stuffs on a regular basis. They need a utility-bike/trike-share program Also it will be out of control what one could do with a basket even beyond its capacity. IMO it's not bikeshare's mission to provide grocery shopping means. It's supposed to be for getting from A to B, work commuting, short tours (for tourists, e.g.) and light errands. That's my understanding.