if you remove the pvpers/alts/casuals etc this is actually quite a big number. Divide this by whatever the number of "serious" progression guilds out there, and I imagine it basically represents at least 1 for every 10m and 2+ for every 25m guild. Essentially, whoever "needed" one (i.e. mages of semi/hard-core guilds) pretty much has one, and even boomkins/eles got a chance to get them since everyone else got it