i get ya.. took me quite a bit to justify the jump - but its paid dividend for me because of the volume of online shopping i do. i still cant justify the sams/costo membership. the primary difference as i see it - with those paid membership warehouse clubs you have to buy in such bulk to offset the membership that its just not practical for me. i mean dont get me wrong, the price on that 5 gallon bucket of pickle chips is awesome, and they're great pickles ... i just dont have a use for 5 gallons of pickle chips - or a gallon of mustard lol
at least with amazon the order quantities are practical 
plus, i'll happily order stuff for my family too. if they want something i just have them go buy a gift card at the gas station for whatever their item costs, quick phone call, i load the card to my account and a few clicks later their stuff is on the way. i have their addresses saved in my account. amazon doesnt seem to care where they're shipping stuff to, or how many shipping addresses you have saved 
between personal shopping, the family and work shopping i'm purchasing a couple grand worth of merchandise a year thru my account. so i'm absolutely killing them on the 2 day shipping thing, beyond the regular savings i get from shopping with them on everyday items
like today, i ordered some motor oil for my quad. locally its like $7.85/qt. amazon was 4.27/qt with free prime 2day shipping. thats 45% lower than the best price i can get it off the shelf here locally. cant beat that with a stick!
and now back to your regularly scheduled topic derailment 
