Yeah, the biking model seems fairly easy to speculate on, but sort of hard to pin down. Here's some speculation from a per bike perspective.

Revenue

  daily rides*365*$1

Costs

    $250 per bike
  + $15 per month for maintenance
  + 20% chance of catastrophe amortized over the fleet
  = ~$500

+ rebalancers + insurance + overhead?

So maybe 2 rides per bike per day gets them in the green?