Cupcake Bar for Wedding??

What do ya'll think about a Cupcake Bar for a Wedding?  I thought it be a great way to keep everyone entertained and the kids could get their candy fix with all the candy toppings.

I found a place that charges $3.75 per person - https://www.facebook.com/AustinChocolateFountainRental   Does that seem reasonable?

Please let me know if you've seen this at a wedding and how it went.  Thanks!