Question about Skin(s)
It is true that the skin can only be applied once, as a skin. However, you can transmute it as many times as you want thereafter, using transmutation stones (for under level 80 items) and transmutation crystals (for level 80 items). So there’s no reason not to buy it for your sub-level-80 in my opinion, as the transmutation stones are free and plentiful from zone completions and dailies and the like. I bought the Phoenix armor for my level 41 mesmer and she is very happy in it. Whenever she gets a new set of armor, I just transmute the skin onto the new set.
The one reason to hold off would be if you have no fine transmutation stones and no means of getting them. If that is the case, then you would want to wait until you had your “final” level 80 exotic armor set to use the skins. However, keep in mind that ascended armor will be coming out next year sometime, so “final” is relative.
Wait til when u hit 80 then buy skins other wise there will be times where u woukld accidently delete skins u bought from TP.