The reason for the discrepancy between the "from" price and the actual price is that the "from" price is usually calculated for a straightforward (i.e no astigmatism) .5 dioptre correction. If that's all you need, then it's barely (if at all) worth the risk that always goes with surgery.
For actual cases, the charge is generally much, much higher, although the work involved is essentially identical: computer calculates the curve to apply from a scan, and computer controls the laser to apply the correction.
The state of the industry in terms of pricing at the moment is comparable to that of the double-glazing industry in the 70's and 80's.