Isn't their a swap treatment group? I'm sure I've seen one.
I have a friend who's a nail tech and I know she would do my nails and I've done hers, but I do loads of onestroke, 3d nail art etc and not many do that, plus I'm so so fussy lol no one would want to do them lol and think I moan I do love watching my nails change as I add stuff, quiet few hours just me and art.
Also my nails are my free advertisement and when people ask where did you get your nails done I have not seen nails like that before, I can say I did them, I painted the flowers, I added the crystal etc which I could not do if someone else did them.
But do think its a good idea, for a swaps thread/group for nails.