It's not just the work load. There's also
this.
That discussion thread, and a few others like it, were circulating the week before an A-meet that I was directing, and let me tell you, reading all of that was horrifying. Here I was just a few days before directing an A-meet, and I was dreading it. Literally.
For a club, what are the risks and rewards for hosting an A-meet?
The rewards are that you'll feel good about taking on a community project, you'll make some money to pay for new maps, and maybe you'll get thanked by a few hundred people.
The risks are that you'll be short on volunteers, things will get missed, some people will get angry, you lose the reputation of your club, and those who did volunteer get either fed up or burned out.
Understanding the risk vs reward, I can see how some clubs have no desire to host an A-meet, when they can be content hosting a B-meet.
Tucson should do whatever it wants to do. If it wants to do a B-meet, then great!