I collect a lot of things and see people charging $10 to ship an item that weighs 3 ounces or less.
Since I collect these items, I am in no hurry to get them, so I don't mind paying less for shipping if it saves me money.
I have asked lots of sellers if they can ship the item for $3.50-$4.50 first class. Most of these items can ship for $2.60 and change, and I figure a dollar or two to cover the box or bubble mailer.
99% of sellers I run into flat out refuse, usually the excuse is "first class mail wouldn't be any cheaper". They literally think FCM costs $6-$7. Maybe retail on a 16 ounce box.
I know this might sound like "whinning", but when you collect 50-60 of these things a year, $5 is quite a difference.