all these things take up space... so you build it and then it's like sure you want to enjoy it some but eventually you end up with all these useless little (or even not so little) models and they collect dust and clutter up space... so it's like you really need to consider what you build and why... because you can't even give these things away most of the time...

then there are some folks who make a living at it... for example Corporations like to have models of their buildings or their heavy machinery for display among other professional markets like museums etc...