"I suppose it would make a good social club for networking, mutual benefits, friendships"
Sure, and if it were only that, DM groups like we have on X (anyone want to be added, pls PM me, and I'll get you added - you only need an X account) with the aim to reach 10 MN people in the next decade would be worth it.
But it's not just about that, Matthew. It's about evangelizing non-Christians and saving souls. Atheists, Hindus, Muslims, Buddhists etc. Also, reconciling Protestants and Orthodox to the Roman Catholic Church. Surely, you'll agree that is at least as valuable as building radios if not more, right Matthew. Those who want to build radios and develop expertise in that, go for it. But that doesn't give eternal rewards. Evangelism gives eternal rewards/treasures in Heaven/merits and blessings from God for doing it. So I think it is something Catholics who can should be doing.
God Bless.