No.
But many of us do enjoy discussing what we receive and send.
We do it because it is fun, it is usually interesting, and it gives us a chance to interact with photographers around the world.
I can, as an example, receive a print from bedrof in Moscow and share with him what I appreciate about it.
That's a real, live, in the hand print.
And he can do the same with me.
Exactly this! I enjoy the interaction with other photographers the most.
As for critique, in my opinion after all the effort that has gone into making a print and sending it out, the least I can do is give my feedback to the sender. It doesn't have to be "I don't like the lamp post sticking out of his/her head", I usually tell what stands out in a positive way to me. At the same time, this forces me to really spend some time to take a print in, which also allows me to learn from it and become better at printing my own work.
A win-win I think!
And as for cost, darkroom materials aren't cheap, that's true. Stamps aren't cheap anymore either. And anyone should decide the value vs cost for themselves.
For me there's a nice balance between value (to me) and cost in the Blind Print Exchange, which currently runs about 3 times a year I think.
That's 3 prints and 3 stamps a year, where I get 3 prints in return (or more, I usually try to send 2 prints in a BPX round).
