I feel like some of the store items have their attraction ramped up as well, because sims cant seem to resist them even if it goes against their traits. Like, i have this technophobe sim who keeps using this one game i bought from the store and she keeps getting a negative moodlet because of it. I finally got rid of the thing but i noticed this phenomena with some other store items too, like that basketball machine thingy. I think maybe they raise the advertising value for the store stuff so that you feel you got your money's worth when you see your sims constantly using the stuff, and yes i find the resulting obsessiveness annoying.
