There is a misconception here. The key is that scans are not done by a scanner, any more than prints are made by an enlarger or photos are made by a camera. Certainly, if you have a camera (or enlarger) with a good lens you have a better chance of a sharper image. However, photos are made by a photographer, not a piece of equipment.
There are roughly 10 exposures on a 6x7 roll, so these scans are $1.20 apiece. That means the scanner is doing all the work. There is no time for adjustment.
My price for 6x7 scans is $125, literally 100 times the cost of NCP scans. In fact, this is inexpensive in the realm of high end scans. My scans are done at 8000 spi/ppi/dpi, 16 Bit RGB and run about 2.2 Gigs each. Each one is custom-tuned for the image characteristics, and the style of the photographer's work. Each one takes about an hour of my time, and about 45 minutes of the drum scanner's time. The scanner is an Aztek Premier, at $40,000 new, one of the best scanners ever made. If a scan isn't perfect, its redone until it is.
There is no comparison whatsoever between what I am delivering and something one can get for a dollar.
If all you need is a $1 scan, then great.However, the OP asked for "good scans" so I thought I would pipe in here...
Lenny