Most people have a backlog.
Most people buy games at bargain/sale prices.
Some people forget what they own/bought.
Is there a free software for cataloging your video game collection?
I can't remember where I saw/read it, all you had do was put in the barcode for a title you own and it would auto populate the details - obviously had to have internet connection. Can't remember if it was cloud based or local, free or paid. :(
In before comments: Google it or just use a spreadsheet or build your own database. :'(