The Schoeps shockmounts clamp the cable and thus isolate the microphone from cable motion or vibration. That's particularly important with directional microphones such as cardioids, supercardioids and figure-8s. How much price difference that is worth is up to you, but any shock mount that doesn't isolate a loop of the cable in that way will deliver inferior results in everyday recording situations. I used to use the Shure "rubber donuts" (A53M) which are well built and relatively inexpensive, but they suffer from the same lack.
If the price of the Schoeps shock mounts seems excessive, you might consider the Rycote InVision series for $62 list (U.S.). They're first-rate.
--best regards