Stuff packs are entirely optional, much like any other pack depending on your taste and if you can see yourself using them.
For a Sims game, ANY sims game they are not cheap, since each one has a variety of DLC packs on hand and of course when you add them up when the games are still new it is pretty expensive. Value pretty much varies from person to person.
$10US isn't much on its own. About the price if not more I would waste by eating out for myself or when I use to buy coffee everyday and of course when you add it up it's a lot, but did I enjoy my coffee? Absolutely and still do, though I just cut back on it more so these days if I don't absolutely need it.
I have a couple of stuff packs I really enjoy and use often. Anything else? I don't even look at it twice because I'm not gonna use it and/or thought it wasn't worth the price. Much like Romantic garden. I didn't buy that until recently for $5.