I don't think repositioning between cities will be a big deal as I see no reason to believe bikes would flow in an unbalanced way between Mississauga and Toronto, for instance. I think most of the rebalancing is 'uphill' as people are more inclined to take an acoustic bike downhill vs uphill. If the pool is shared, there is no reason a specific bike needs to be moved from the west end of Mississauga to Scarborough, for instance. And a big part of the cost is I imagine the loading and unloading, not so much the driving between stations.
Most of Mississauga has pretty good off-street trailers (though somewhat circuitous) and good multiuse paths along arterials.