sporting
Halachically, you only need to provide 2 ready-to-eat portions of food to one person; but if you are lucky enough to have many friends and neighbors, you'll naturally want to spread the holiday cheer, and at the very least reciprocate the gifts of food you're given. This is where things could get rather pricey.
Also, if you're like many recipients of Mishlochei Manot, you end up with a ton of junk food that nobody could possibly eat in the short month before Pesach, and the surplus ends up in the garbage with the Chametz.
I don't think there's one good answer to this dilemma. Each family has to consider the number of people they'll likely be giving Mishloach Manot to, who these people are, their personal budget, and the approach prevalent in their community. So here are a few things to consider when preparing your offerings:
