I dont include BIN or best offer on auction items, and only start them at a price I am willing to accept.  Still get plenty of stupid offers!!

I will often have items listed BIN  over 30 days  and then run similar items in auctions over short duration.  Currently waiting to see if they repeat the Sunday offer before putting some more auctions up.  Last week I was able to offset slightly lower auction prices

against low fees,  saved over $250 in fees, so was happy enough.   Dont sell at a loss just to make a sale, not worth it.  and make sure you cover  full postage costs not just stamp value.