So, just to get this right:
You acquire the recipe and – with considerable effort – learn to craft an item (unlimited times, I suppose?) that grants you access to a skill similiar to the funcionality of the mesmer’s portals, and it’s a one-time use?
So you’d have to craft the item 3 times if you’d want to place 3 Portals (e.g. porting your friends through JPs) … which sounds okay, I guess.