Except if you are playing in RF or some black magic where simulation does not cut it...
Yeah, there are things you shouldn't be buying "just in case" - for example, a stash of SoCs will age faster than you can use them - but definitely buy a hundred of common capacitors, such as 100 nF, 1 µF, or 10 µF, rather than buying them one-by-one.
You generally don't need a complete set of all standard resistances or capacitances - there are precious few circuits where you need precisely 47 pF and 6.8 kΩ - but there's plenty of stuff that goes into almost every single project you build. Battery clips, 100 Ω / 1k / 10k resistors, 100 nF / 1 µF / 10 µF decoupling caps, LEDs, PCB-mount switches...
That obviously doesn't apply to the more expensive components.
Or the larger ones! I bought a 100 of pretty much every standard resistor value in through-hole format from a bulk seller and came to regret the mess of loosely taped together resistor bundles intermixing and tangling and the shelf space they occupied!