Cheaper gold, player on sale, one time sale...etc those kind of in game gold sale advertisement make people uncomfortable.
You can have section of in game menu to gather them all together and let people review these ADs anytime they want.
Especially for the stadium sale, i can't never find that again if I skip this AD.
Please consider use some places in game to put them together. Don't use POPUPs which is not a good idea.