Some attorneys charge per appearance (most of the $250 guys), others charge flat rate (some include trial, some exclude it).
There are also other attorneys that are desperate for any clients, so they'll be far cheaper than anyone else, but often far less experienced.
There are even some attorneys that have mastered playing scheduling games, so they'll have 25 cases all scheduled for the same day so they can really get their bang for the buck with an appearance. Many of those guys are fairly cheap and flat rate...because they were already going to court that day anyway.

The entire point is to make it not worth it for you to fight the ticket.
Heres an example: https://www.reddit.com/r/IdiotsInCars/s/584bgJvF5Q
"Obstructing the passage of other vehicles." That was multiple Zoom hearings that each took hours, multiple calls that were over an hour, multiple snail mail letters going back and forth, providing the state with discovery, begging for discovery from the state and getting nothing, then trial was scheduled 3 times. First one no cop, second one no cop or prosecutor, and finally I got my trial on the third time. Not guilty.
So, $400+ in hotel stays, over 1,000 miles on my car driving down there over and over, 6+ days of work missed, having to waste ~6 hours in the middle of a day while I was on vacation dealing with it, and having the case hanging over my head for a year...as to fight a $55 citation...and I did nothing wrong.