This poll is biased.
In my experience, a non-exclusive In-Stock Re-Seller is almost always less expensive than an exclusive In-Stock Re-Seller due to increased competition.
This.
I'm only interested in buying from an in-stock reseller, be they exclusive, non-exclusive or whatever. (As long as they haven't just fallen off the back of a truck!) The reseller that offers the best terms is the one that gets my business, (price+shipping cost+delivery options).
I think you're going down the wrong path with exclusive vs non-exclusive. Stick to in stock with reliable supply options and you'll be OK.