Understanding tourists spending money (economy)?

Say some country(particularly a smaller country) is very popular with tourists, so millions of tourists go every year and spend their money. Well after a while does that country not become flooded with money. This small country will have it own outgoing tourists who also spend their money, but it seems like a country could get very rich this way. The countries income would far outweigh the outcome, basically syphoninginternational money. I would imagine say holland have this potential, how do the worlds financies always seem so linear?