Could be worth it if we are going to maintain rare species or hybrids, or perhaps maintain large lawns of carpet plants for those starting new aquaria.
I think this will be a waste of time if everyone is growing R. rotundifolia and C. Wendtii.
Now, if it's a way that we can trade 2 square feet of C. Parva, for a pound of peacock moss, or maybe spread around some rare Cryptocorynes, then I'll set up 3 more tanks just to grow out plants.
At the same time, there are great forum members who sell unusual plants here on a regular basis, and it would be improper to make the plants they are trying to profit from available free to everyone. I believe this deserves some real consideration. So perhaps a membership of some sort would be required.