I noticed in store I am offered 400acoins for $2 but my sons account has 1500acoins for $4! Why does he get nearly twice the deal 375acoins/$1 while i get 200acoins/$1?
The offers that you receive in the "Flash Deals" tab are random so they are indeed different for every player. Make sure you frequently check the deals to catch the offer you are looking for.
I'm a regular and check multiple times daily i've never seen deals like this seems not random, but negatively tiered by division or playtime. So as you start playing you can grt a 4to1 acoins per $1. but then transfers to 1to1