Okay so i spent the last 30 minutes reading this x.x
I've had no Guild War experience on Fiesta whatsoever. However, I have to say one thing. The name of this battle is called "Guild Wars". If you are talking about cash item affecting 1v1 PVP, then I understand, but the topic title says that it affects "guild wars".
I said before that i haven't had any experience on Fiesta guild wars, but I've participated plenty in Ragnarok guild wars (Which is so much better lol). The point of guild wars is for a whole guild versing another whole guild. So what if the other player has cashshop items, 1 person can't take on 10 other persons. If your whole guild fights together, then that person can be pummeled to the ground easily, even with the help of cashshop items.
Sure, 1 or 2 people in the other guild may have cashshop items. So what do you do? You plan your guild strategy, and target them first. Guild wars isn't about 1 person versing another person. It's guild versus guild, so small factors like cashshop items which affect individuals won't affect anything in guildwars. It's not like every single person in your oposing guild are cashshop users.
By the way, this is coming from a person who doesn't use cashshop items(that's me if you haven't figured it out

).
Oh: And by the way: In my opinion, I reckon the game designer did not consider the balance that is required for PVP when they made the game. For example in ragnarok, each class has a special ability that is balanced. Acolytes can chose to be a full support healer, whilst swordmen can chose to be tankers. Their skills and abilities are limited. There is always a strategy in guild wars. Take out that acolyte first! Anyways, my point is, The game designers have yet to show us that they prepared the classes for a balanced pvp gameplay.