I wouldn't say that a larger purchase unit is a USP; it is an underlying reason why other USPs are able to be delivered. This is an engineering focused place, s

I wouldn't say that a larger purchase unit is a USP; it is an underlying reason why other USPs are able to be delivered. This is an engineering focused place, so I tended to focus on the engineering aspects. My sibling commentor just left a great answer to your second question, so I'll leave that one there :)