There's another problem with this booster pack thing unless they do something drastic. As stated above, the 'uber' guilds will likely destroy everything in their path. They will start up 'alt guilds' to take the place of those they destroyed and be able to 'enjoy pvp' even more.
My issue is that these towers will be providing benefits to the owner guilds. So not only do the destroyers have an advantage from the start, once they clean up the normal player's towers, they end up being even more uber. Even if you don't PvP, being in this guild will make you a better character than if you just join up with people you like and with whom you think alike.
So now you are 'forced' once again to join the 'uber' guild to gain the benefits of playing the game. It isn't bad enough the 'uber' guilds hog all the unique mob encounters and Tarasque. But, now they'll be getting bigger and better.
There's a lot of checks and balances that need to be put in regarding these things. I want to put one up with my guild and enjoy defending it. I don't want it to be attacked the second I put it up and have absolutely NO CHANCE of defeating the megalo-guilds with 300 members and a dozen over lvl 200. That would be like us going to Tarasque and trying to have some fun.