Easily exploitable, you could go max level with your main while still loom items with your alts that your main would get ...
I would say a one-time exchange for loom points would be ok, but it's not easily implemented in a proper way if you're thinking on a permanent trade time.
How is it a bad thing to be able to give your main more looms? you still have to put all the time on your alt to get to 31...
I am trying to get more looms on my main because of all the changes made since i stopped retiring.
For example increased upkeep. so i can't use the looms i have now so i would like to loom some cheaper equipment. but since I am at 100m xp retiring and wasting all that xp is out of the question.
The only way to get more looms is to trade and what is on the market right now is mostly all the high upkeep items that i can't afford to use all the time.
I would prefer if people couldn't use gold in any way with alts though, or else we will see alot of people grinding in peasant gear with alts to get gold and the other 1/2 of the time using full plate/all the most expensive gear on the main.