From my little experience of camping in Switzerland:
- the price depends highly on the popularity of the spot - eg: in the Jungfrau region was really expensive (I seem to remember it was about 40chf for one night in a tent).
- the facilities differ and are generally good but, again, in the popular spots you're likely to find a more 'resort-like' camping area, including busloads of tourists (which I hate!).
- you can still expect some amazing views in the paid places, but the view may include your neighbour's tent
- Oschner is the more expensive end of the spectrum. You can buy second hand tents from ricardo.ch (or similar) quite cheaply if you're on a budget.

Hope this helps.
Mark