That's only true for the high-end restaurants on the list (the ones with 17-18 points out of the max. 20). Prices should go down the farther down on the list you go.
One thing to keep in mind:
- All restaurants with 13 points or more are great
- Those with 15 points or more are REALLY great
- Those with 17 points or more are REALLY, REALLY great
- and anything at 19 or above will blow you mind away (quality and price-wise)