Appetizers are a great way to extend the variety of items you have for your guest's at a party. The problem lies in the execution! Things to consider are the number of unique items you choose to have and the placement of those items.
Most host's lay out a cornucopia of goodies on the same table the entrees will eventually be served at. There's the first problem, your beautiful tablescape goes from looking like a Rockwell Picture to an animal feeding trough in a matter of seconds!!
Having everyone at your party hoard around a central hub and have to force there way into the crowd to get there grub is a bad thing. Try placing these snack Items throughout your party zone. Make sure there's ample seating near each snack area where your friends can gather in small groups.
This leads me to the next problem, variety. If you have a lot of different kinds of snack, you'll probably wind up buying way too much because you want there to be enough for everyone to sample everything. That can really raise the cost of your party. Instead, pick no more than two to three appetizers. This way there will be plenty of room for your snack "pods" to expand and converse comfortably. Without having to navigate through a table of bowls and cups!
We'll until next time, Party Smart!