A network of people who support each other and grow together in the hard times, are likely to laugh and enjoy together in the good times.
I agree with you, in this way the friendship relationship is formed, and that is something that can not be bought ... if you try to buy it, it would not be real, it would be superficial, only the experiences together is what create a true relationship
These relationships are going to be important in many ways in the future, some of them will be lifelong.