I think that Disney is missing a major opportunity here!
My family and I visit a resort in North Florida every year where bike riding is the primary means of transportation. They have a huge fleet of bikes there that they rent out for $10 per day (24 hours), and they have three day, weekly, two week, and monthly rates too. At those prices, it is tempting to just rent a bike, rather than putting on the bike rack and hauling a bunch of bikes.
At FW, they charge $21 a day, and you can't even keep the bike overnight! Since there are no overnight rentals, there are no weekly rates. How many people do they think are going to lay out $21 a day to rent a bike? And not many folks are going to do it more than once. I mean, you would have to get back and forth to the bike barn, stand in line, etc. Who wants to deal with that? Plus, you can buy a bike that is equivalent to what they rent for about $100.
On the other hand, if they made the cost more affordable, I would probably be interested. Yes, it would be a huge hassle for them (people not returning bikes, bikes in the lakes and canals, people riding bikes to WL and beyond, etc. etc.) but I think there is a lot of money being left in our pockets. Disney usually does a better job getting it!!
TCD