I think BIN is good for quality & valued items with low demand...you are seeking the right buyer. $300 would be fair but $200 would be acceptable to get a sale.
$1m min bid gets more bidder and you hope for a bidding war....it also attracts bargin hunters. one bad element of
ebay is when sellers do the $1 min bid and then have friends bid it up to their floor.
$1 min bid is good for high traffic items where either the sales price is very predictable based on past auctions or there is mystery and bidding has shown to go higher than real value...ie. bidders love Scott Speciality pages and often will put a premium on collections with them....or they love pre-1940 albums (vol 1) where they hope there will be some gems.
I think it depends on the item and description.