Or, as the system actually works:
_Hey, Bob, swap to healer for this boss fight, please.
*0g*
_Bob, can you swap back to DPS for the trash?
*0g*
_Okay Bob, you'll heal on this boss.
*20g*
_Oh wait, Lisa and Bill are enough, stay DPS please.
*0g*
_Okay so the next one is really tough, we'll need 3 healers here.
*41g*
_Bob, switch back to DPS again, to continue illustrating this system.
*0g*
_Heal again, Bob...again!
*62g*
_Damn it, we're not done. Switch back to DPS!
*0g*
_Okay, heal one last time, Bob, because we've capped out, so it would get repetitive after this.
*62g*
_And switch back to DPS one last time. I'm sorry, Bob.
*0g*
How many re-specs did you do tonight, Bob? 10? Wow...how much did that cost you? 185g? Well, so much for the spectral tiger mount...