I will not pretend to answer for the guild leaders, but I will offer what I believe to be the reason for this rule.
Allowing alts or 2nd accounts to join other guilds could be construed as spying on the other guilds. This was not something we as a guild wanted to be accused of by other guilds. It stands to reason if you have more than one character in more than one guild you would have knowledge that perhaps you could use against the other guild. This would put EVL in a very defense position and tarnish our reputation in the game.
While I understand your point of wanting to start a guild of your own for a RP situation maybe there is another solution to this problem.
Perhaps within the guild you could run a sub guild for the Kobold war camp RP? We have a warring guild to protect miners and keep those of us not interested in PVP from having to do PVP. I don’t see any reason why your guild idea couldn’t be a sub guild.
This of course should be brought up at a meeting and voted on by the guild leaders. So before anyone gets upset bring it up as new business and see how it flys.
Good luck on your idea I hope it passes.
Hey Galdar, just so you know this was posted in the Public forums and not our member forums which is probably why you did not really get a reply from a council elder. Cally is right on the nose with his response though.