Someone (sorry, not the best reference) suggested that greater mobile activity leads to greater diversity in pokemon spawning. At Rhodes I caught Jynx, Magmar and Kangaskhan within 1 hr.
It doesn't look like it for the time being. Otherwise its a no brainer for a business owner to pay for several lures during the day (meal hours). Most of the time you would be able to spot one very serious customer taking advantage of the lure they've dropped down.
That sounds counteractive to their goal of getting people out and moving!