You can sell the threads or you can use them to craft jackets for 500 threads and 1 luminous stone. The threads don't sell for a lot since so many people are opening crates and are getting threads
well you kind of did not lose the money cause if you sell the car to the gov yet you can make the money make since opening itself gave you close to 2.5 mil well thas a big W
If I sold all the cars, I would get 1.75m from them which would put me at a loss, but who would sell them. Now I have one for my family and one for me. The only thing is that the McLarens are extremely easy to get stolen, I lost both McLarens 2 weeks after getting them, both were in greenzone. If you get a McLaren just be safe :)