How many of you all used to play Shaiya before there were raids? In PvP what happened if you didn't get in the "strong" Party of max 7 people? Did you go cry on the sidelines or did you try to make your own party, strategize on how to beat out the strong party or parties, and get some kills as a team?
I'm afraid that by making raids bigger, it will only encourage more people to ride coat tails and leech their way to the higher rank instead of doing their part.
Anyone has the ability to make a raid. So you can't get in? Make your own. Can't get any kills? Start communicating with your raid members and work as a unit. That's why you're all lumped together, right?
30 is plenty enough for one raid. Besides, if any more slots were added to raid, where would you fit it on your screen? As a healer, I have to keep the whole raid window open. Why? Because I do my part in the raid and I heal everybody, not just my party or my friends.