I send in my Fold 3 on tuesday and just gotten it back yesterday, so I roughly know why the repair cost for the fold 3 screen is very expensive
Long story short after using my fold 3 for a week or 2, the top and bottom rubber seal loosen and 1 small part of the bottom bezel goes under the main screen
So I send it in for servicing and luckily they say this 2 problems is covered under warranty, and when they ask me to do a factory reset on my phone, i was confuse because I thought it was just a simple screen replacement
And when I got back, I was shocked that my phone feel brand new with all the new plastic protector, so they told me the repair was very complex that they have to replace new parts for almost everything, from the fold back/side casing and the fold hinge, basically the technician have to open up the entire phone to repair the screen thus i believe why the repair cost for the inner screen is so expensive
And btw they even give me a free pouch (But too bad can't fit my Fold 3 or flip 3 but its better than nothing