It's easy to be cynical when you personally can't detect the benefits.
I don't have a lot of confidence that the sheer dosage of nutrients (in vitamins) is healthy long term. More isn't necessarily better. You can overdo. Just because no ill effects have been discerned up to certain dosage levels, doesn't mean there are no ill effects.
But I'm positive I've felt restoration and healing from taking vitamins. So I'd say halving the daily dosage of whatever you buy is good for health maintenance (it mitigates damages from overenthusiastic manufacturers who pile on ingredients). Granted, with certain vitamins you have to take high levels to notice the specific therapeutic benefit you're hoping for.
Also, I'm aware some vitamins are sold at far higher prices that they're worth, a real money drain.
So, yes, vitamins are usually a waste of some money - but NOT a total waste of money.
Your body will benefit.