It is an easy way to deliver a model in a file. Or to offer its components individually as a download. With the latter option, I achieve 10 times as many downloads for 10 parts of a model if each part has to be downloaded separately.
Therefore, it is not an option to simply reduce the number of points. This would not be fair to users who spend days or weeks on a model and then upload it with several print plates in total. Why should such users bother to upload anything at all if they can’t even collect points for the first downloads?