it also comes down to legendaries...im not going to play unholy when ym best legendary for the spec is sephuz....maybe once i get a few unholy legendaries ill consider playing unholy...until then...I'd rather just not raid because it's as much of a disservice to play unholy with shit legendaries as it is to just play frost.
At least if i stuck with frost they'd know im stuck in a bad spec...if i play unholy and my numbers are below expectation they just think I suck...they being many guilds you'd be in or app for.