I think your thoughts on economics need to be questioned when you think you are getting the games for free because you are trading in a ps4.
Money can be exchanged for goods and services, but goods and services can also be exchanged for goods and services, at no point do the games become free, you are giving a system which has a resale value of €275, you are using that to get 165 worth of gamestop store credit to buy games, your choice to utilize the ease of gamestop to do this trade rather than selling your PS4 yourself for 110 more shows that you really have more worries than a switch title which came out last week costing 60 compared to the ps4 version which launched 9 months ago costing 20, had you invested the time to jump on a facebook group to sell the system you would have had enough to buy the switch versions of the games you wanted, but now you've added more titles to the backlog you have on the ps4 rather than on a system you can shove in your pocket to work through those games when you get a few minutes.
Just some food for thought.
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