I've never hired anyone in the sign industry, but I've been a part of it for about 15 years as an employee. Here's my history and maybe a perspective from the other side.
Shop #1
I started at a Fastsigns in FL making ~$8/hr, but wasn't there long as I found out I was just filler until the assistant manager came back from breaking her arm in multiple places loading the laminator.
Shop #2
Moved back up to VA and basically ran a shop for the owners who never showed up, making $12/hr. I had a bunch of debt from a bad breakup in FL and I had to live with my folks for a while so the money was fine but it wasn't a livable wage if I had to pay more than the $300/mo they charged me. After 5 years of that I was making a whopping $13/hr when they decided to just change the locks over the weekend and hire part time people instead, with zero notice. They told me I could just be on call and work when they needed me (read: let the work build up, then have me come in for a couple days a week and work myself to the bone. They had me design, proof, print, and wrap 2 cars in a weekend with zero assistance in the past and never paid overtime so I knew this wasn't going to work. When I declined their 'generous' offer to re-hire me as an on call employee they fought me on the unemployment, so I ended up getting nothing for a couple months while I was looking for a new job.
Shop #3
Had to take a pay cut back to $10/hr starting at a new place and only after 3 years with no raise and interviewing with another shop that was willing to pay more I suddenly got a raise to $16/hr, which was finally enough to start looking at a ~$100,000 townhouse with the savings I'd built up after selling my dignity and living above my parents garage for the last ~8 years. Worked there for another 2 years. Still friends with the owner but I knew he wasn't gonna pay more and I had to move on.
Shop #4
Started dating a college girl in NC and want to move there, and I get a job making $19/hr. Sounded like a lot of money to me but come to find out that it doesn't exactly go very far when a shithole apartment around here is $1200-1500/mo + all sorts of mandatory fees like trash service (its a dumpster that gets emptied once a week, stop pretending), and a $100 cable package that doesn't even include the cable box or modem. 3 years there, with yearly 3% raise and I'm making more than I ever have, but also basically living off of my credit cards which are now maxed out and after paying rent and the minimum payments on the cards I've got about $300 to cover gas which is about $120/mo with a long commute, food (I try to eat once or twice a day if I can manage), and any other unexpected bills (had 4 root canals in the last year and a half).
Now I'm on my way out of the signage industry in a couple weeks. Turning my hobby / side business of 3D printing into a career as a field service engineer. It's a decent pay bump and I see a lot more room for growth.
I think one of the biggest problems in the industry is how cheap the end products are expected to be. People want a high quality product made locally with next day turnaround, but they want to pay like it's coming on the slow boat from China.