Pay for parking?

Our reception is at a restaurant in the downtown of where we live. There is on street metered parking (1.50 an hour) and then, there are garages just a minute walk away which also charge $1.50 an hour. Our reception is simply a lunch, dessert, and drinks -- nothing more (we went untraditional and aren't doing the wedding receptiony stuff). We have the venue from 1:30-5 but we anticipate being done much before that (probably around 4). My question for you is: should we pay for our guests' parking? We will be including an information card with where to park for those unfamiliar with the area. We have about 50 guests coming.