Citibike is getting some pressure to expand to low-income neighborhoods. However, Motivate, the company that operates Citibike, can’t do that sort of expansion without some public funding, and the transportation commissioner seems to agree. I think this could be money well spent.
There are a couple success stories in the article linked above. For example, the woman that rides Citibike so often, each trip is about 9¢! That’s almost cheaper than walking.