The MoBike official cost is about 3000 RMB(used to be 6000 at first). But there is some additional cost: the parts are not standard, and the design is totally new. When they produce more the cost will come down. I don't think such a bike worth 3000, but maybe true, they can be much cheaper to achieve better experience though.
Shared bikes should bear any weather or rude users, this
also increased the cost. And generally, your own bike is not supposed to be in rain storm very often..