Some are fortunate enough to be able to set their rates on the higher end of that scale... say $60.... and still get the work. Consider a hypothetical....
What if you charge $60 and get 30% of the potential jobs?
What if $50 would get you to 50%?
What if $40 got you 90%?
You could argue which would be better for you, but the next guy may not agree.
Also, local competition does impact what the consumer expects to pay. When the local glass shop chains have "$19.95" signs plastered all over their vehicles and storefront windows, people come to think that is normal. Doesn't matter that their repairs suck and they are just trying to bait-and-switch. I don't chase retail work, so it doesn't bother me too much. But while working dealer lots, I have people stop and ask me if I can fix their car. Many people lose interest pretty quick when I quote them $40 or $50. I think I get this reaction more now than I used to, and I think its due at least partly, to the "$19.95" campaign.
For fleets accounts, something that impacts pricing, is what it costs to replace glass. I haven't really tracked replacement prices, but I think it's actually cheaper now than it was 10-15-20 years ago. It would be much easier to increase repair prices if the replacement cost would go up instead of drop. Locally, dealer price is about $125 for a replacement. When it's dirt cheap to replace, it's a tougher sell to repair. If new glass was $250-300+ a pop, that would make life so much easier

No matter what you charge, what if YOU raised your price 20-30% right now? Would it be a good thing?