You underestimate the cash some guys are willing to burn. I'll say if you have >2000 rainbow crystals and have no use of those gold units anymore, AW fodder is perfectly acceptable.
For the rest of us, its mostly :
Is that gold unit worth CCing? Eg. Will I use it often enough? Will reducing cost matter? Is she my waifu?
If the answer is no to those questions then turn them to RC.
Step 2 -