UNREAL 4 - STEAM: Can you sell a game that has marketplace plugins in Steam?

Hi

This must be a very basic question but i´m new to Unreal, i see a lot of people buying market place plugins but after reading Steam infromation on sales it seems your game could not be sold if it has codes and plugins not developed by yourself and there is also many plugins that doesn´t allow to be used for actual games that are going to be sold in Steam… then i´m a bit confuse, why buying a pluging that you an´t actualy use in a final game?

Is this also not really convenient since some plugins stop woring with newer versions of Unreal?

Whats your opinion on this subject?

If you buy something from the marketplace you have the right to use it in a game you sell on Steam