Are you dead-set on going to KMKE? Last I checked, which was quite a while ago, $ignature had raised their price for just showing your face to $46. If you're trying to show them how cool it is to fly somewhere for dinner, KMKE is NOT the place to go.
Here's lots of other recommendations to the north:
* KRAC. Grab the courtesy van and go around the corner to Infusino's (italian). They'll happily put you over gross for less than 10 bucks.
* KRYV. Walk out of the FBO parking lot straight to the main drag (about 2 blocks), go left for about 1/2 block and go to Steakfire. Grill your own. Good food.
* KSBM. You really want to impress someone, go here. Final Approach restaurant is in the big gray building near the approach end of runway 3. One of the top three airport restaurants in the country, IMO.
Now, if you want to show your friends some average-to-bad ATC, crappy line service at an FBO, exhorbitant fees, and spending a crapload of money on a mediocre dinner, KMKE is a great choice.