I think it's safe to say most of think this is a crazy idea.

You would need to actually keep a spare one of those around.  Otherwise if you have a problem you've got 18 GPUs that aren't mining.  And it's not like you can go to the local computer store and pickup another one. You have to order it.

Not to mention the complexities of getting it all running.  Meanwhile someone only running 4-7 cards per rig already has been up and running mining and making $$$ while you're fiddling with your toy

No thank you.