My house was built in 86 and had Federal Pacific which I replaced in the 90s. The new arc fault breakers are $40 each. Old style is $8. When I replaced my panel I remeber the new panel (200amp) was about $150 and the breakers $4 each. I did it myself on a Saturday. If you have 20 breakers at $40 each that is $800. Not really outrageous but seems a lot to those of us used to paying 1/10 that.
A problem that my neighborhood has is the gas meter is directly below the electrical panel--not allowed by code now. So if you call an electrician to replace your FPE breakers, he will have to bid the job to move the box and bids have all been well north of $10K.
Jerry