Two things. First, you have to find a drummer tight enough to play well with a click. Far fewer can actually do it than SAY they can do it.
Then your gear has to have a click out, and the drummer has to use headphones (looks dorky) or in-ear monitors. Trying to play to the track without the click mixed in is a recipe for disaster.
Sadly, at the club level, there are few drummers that can stay tight and locked to a track and click. This takes studio drummer skills. And not too many of them are much into club gigs unless VERY well paid. It only takes a bit of slop, a moment's inattention, and you have at best a really poor pocket to dance and play to, and at worst a train wreck...
Lastly, real drummers have a HUGE dynamic range compared to MIDI tracks. The tendency is to start to get a little frisky, and the next thing you know, your carefully mixed tracks are an inaudible, distant noise. I rarely EVER see MIDI acts (or karaoke MP3 acts) with live drummers that the keyboard track parts are loud enough. Maybe at the START of the set, but by the time a few songs have gone by, kiss them goodnight!
Now, don't get me wrong... it CAN be done. But personally, I wouldn't go with any drummer that hadn't already done CONSIDERABLE work in this format before. There are just too many things that can go wrong....