Let users give multiple vouches.

My name is Domcon and I approve this message.

Nice suggestion. I support it.
 
You can simple edit your previous vouch and add on the price of your second/multiple deals. I think the reason for a simple vouch per member is to prevent vouch spam or manipulation of some sort. Just simple edit your previous vouches if you have a same customer, that's what I've done, I've had several several deals, but only like 6 vouches, because I have customer repeats.