I for one think Tekkit is incomplete without EE. I would love to implement it into my server, because I trust my users. Think about all the possibilities it opens up. Those who have it on SSP know what i'm talking about. Also consider how well it works with Buildcraft, Redpower, and Industrial Craft, the automation mods. EE allows for a lot more automation. For instance, if say you want to make an automated lava cell factory to feed some geothermal generators, but don't want to constantly resupply it with lava buckets, you could place the volcanite amulet in a chest and viola! Or how about users that get pissed off from all their stuff being burned when they fall in lava? The volcanite amulet also takes care of that! As long as you aren't inviting every single person you see into your server, you shouldn't have to worry about griefing too much. Besides, servers with mods are usually for groups of friends.