I have to again remark that it is awkward to speak about "rebates of up to 60%" if most of the items offered have no comparable market price as these items are not available besides special offers like this black Friday sale where they (almost) always get a rebate...
The only items such a rebate advertisement would be proper for, are FP, goods and the few direct buy packages (army, research, buildings), as these are the only things buyable in the regular game with the usage of diamonds or real money.