At this point of tike there is 14 stuff packs, each cost 10$ that would 140$ for stuff packs compilation and you would hardly get enough content to expand on the base game and keep you interested for ...
In response to the title of the thread - compared to what? A pack of bread? Yeah. But buying Sims 4 content will never have any impact on our budget. Not even at full price.
When it comes to the cost of this game and its packs AND the candy, I'm with @Sheepiling :D