You can use the SteamDB Free Packages tool and a browser extension to mass-activate thousands of free-to-play games and DLCs simultaneously.
According to tracking from Steam.seewang.me , the cost to purchase every game on the platform fluctuates based on active sales: ~$1,385,598.50 Discounted Price: ~$1,337,311.32 Practical Challenges & Solutions buy all of steam
Note that Steam’s terms of service clarify you are purchasing a license to play games, not permanent ownership of the software itself. How to Manage Large-Scale Acquisitions You can use the SteamDB Free Packages tool
Steam is not designed for bulk purchasing of the entire catalog, leading to several technical hurdles: Mass activate free Steam Games | SteamDB Free
Developers often create Steam Bundles that allow you to buy entire franchises or publisher catalogs at a set discount. Mass activate free Steam Games | SteamDB Free Packages tool
You cannot add the entire Steam library to a single cart at once.
If you are looking to expand your library significantly, these methods are more efficient: