OP, I stopped MSing in 2006. At that time I was getting $20 for valet parking (30 mins) and $25 for an apt shop. I started back up in 2015. Those same shops pay $15-18 for valet parking (45 mins) and still $25 for the apt shop. Fees have either stagnated or declined for a variety of reasons that @isaiah58 mentioned and also due to the Great Recession of 2008.
Sometimes it seems that the fee gets conflated with an hourly rate. Just because the fee is $10 - $15 doesn't mean you're making that much an hour. You might finish the shop and report in 30 minutes in which case your hourly rate is somewhere around $25/hr. Then if you get a reimbursement for something you were going to do anyway, so much the better. And it can go the other way, too. I did one shop for $100 that had so much narrative that it paid me ~$13.50/hour. Live and learn.
You'll find that this topic of "who takes low paying shops" comes up at least once a month. Many people feel strongly that their way is the right way and everyone else has self-esteem issues. Nonsense. It's personal. Everyone who wins in this "game" of MSing has figured out a strategy that works for them, and they are generous enough to share their insight. Someone who can take what I would consider a dog of a shop and make it work for them deserves a lot of respect for their ingenuity and hustle.
I don't what my point is anymore....except to say that MSing has changed in the 20-30 years since you last did it. The fees, sadly, are probably the same, so now it's a strategy game. Get yourself a winning strategy and let us know how it's working for you. You'll get plenty of tips on this forum along the way. Good luck!