More importantly you should ask yourself why are you losing players after a week of a new wipe, compare if the players that stop playing are more than the players that stay, its not something only to EZ servers, all players in all servers behave like that, as soon as the leading players of a server emerge the rest will go and look for another server to start all over again with better odds, they only stay when they feel they can lead in the server... well thats my though, its just a suggestion tho.
Also consider.. in PVE people love building and stuff, having diferent wipe schedules will give them more hours of play and enjoyment...
Plus, you are not taking anything away from players, (remember at least a server will be full month, 2 servers will be 1 week/3 weeks and the other one will be 2 and 2), better yet, you are giving them more options.
cheerio.