Not only have the prices gone up, but the selection has gone down. Back in the day (say, 1990 or so), there were a number of places at FXE that had a number of aircraft, and there was one (Cav-Air) had 14-16 aircraft of all shapes and sizes to fit your budget.
I did a trip out to Centennial in Denver about that time. There were no less than 3 places that had 20+ aircraft for rent, up to and including Mooneys and 210s.
Yep, you got that right; back in the late 80s at Dallas Addison there were several schools/rental outfits with large, diverse fleets... the usual 152/172/182, Cardinal RG, Cherokee/Warrior/Archers, Grumman Cheetahs/Tigers, Mooneys, V35 and A36 Bonanzas, Barons, a Duchess, even a Super Cub. Not any more...
These days, there's not much going on. There's one operator with more than 5 airplanes (and sky high prices), and the others are one-guy/one-plane deals. I sat watching, on a nice, VFR weekend day, and saw little activity.
It was kind of creepy....
I'm surprised to hear that FXE is that quiet. You wanna see a busy airport, come on over to Hooks (DWH) in Houston; there are 2-3 fixed wing flight schools (including United Flights large fleet), plus 2 helicopter schools... add in the corporate jets and turboprops, plus the transient military traffic, and man, what a zoo. One thing I've noticed about the fixed wing schools: none of the students speak English very well; I'm not sure where they're from, but they sure can clog up the tower/ground frequencies with their gibberish. It's pretty maddening when I just want to get in or out quickly in my RV.