I make and sell these potions.. and have recieved some negative feedback.. not because of pricing (I am always fair - although there are always one or two people who want Alchemists to make a loss!!), but waste of money.. not as good as Buffs etc,
The point of these Potion, I believe, is to enhance the ability for the player/group to camp Mob's, without the requirement to rush back to POK and Buff up again.. every 3 hours or so.. Of course these arn't going to replace The high level buffs provided by other characters, nor should it as interaction between players is a vital part of the game. But it never hurts to give people other options.. I use these myself when farming some of the ingredients..
Much like RVR(risk vs reward), the CVE(cost vs effect) is not worth it with these potions.
The day these potions came out, I was sitting in PoK on my lvl 63 chanter Casting 217 KEI, donations accepted but not required. Average donation was 30to 45pp, for 217 MINUTES. Thats 3 HOURS 27 MINUTES, with the option to have speed of valon kicked in for nothing (59 minute haste!).
Needless to say some maroon got C3, then turned around and burnt good coin on one of these that killed my C3, and then sent me a tell saying the potion overwrote it but only had 30 minutes, and asked if I could recast C3 on him. Yes, I was doing it for free, yet accepting donations, but watching people waste it, well, I just logged and switched toons.
Just so you know, support your local buffers, donate and don't be cheap. These potions show you just how much value SoE puts on buffs. CVE is definately higher with player buffs than potion buffs, unless of course its player made. :)