Good observation. I should have noted the use of the ramps downtown and in business areas, never in the suburbs I've lived in.
And I assure you that was the cost (in Califonia) fifteen years ago!
Two or three laborers and a supervisor. Two pickup trucks. Compressor and jackhammer; small loader; dump truck; traffic control; cement truck; concrete finishers, another supervisor... over a span of two or three days.
Is it beginning to make sense now?
I dunno. If sidewalks cost that much, it implies that when they tear up the sidewalk in front of my house, it costs almost as much to replace the sidewalk as it would to rebuild my house.
If you handle several curb cuts at once in an efficient manner, costs should be lower. But this is the government and its contractors, right?
At any rate, if you are putting in a new sidewalk or re-doing an old sidewalk anyway the curb cuts should of course be included.
Mrs VS