This seems like a great idea but maybe it has failed in the execution?
There can be conditions that make members avoid swapping.
There is a certain anxiety (I am assuming) of like with like.
"I only US, or No CTO, or pre 1940" etc etc.
That's fine but, not for me.
I am a world wide collector, all my dupes go in an (clean) ice cream container, as I work through albums.
When I swap, they all go in glassines, and into the package.
You get the ripped, torn, abused, Mint unhinged, revenues, covers, souvenir sheets, and whatever else is in there.
I don't have the time to segregate.
If you find a swap partner that is similar to your regime, it's fabulous.
It may take several tries before you get similar achievements.