While that may be true for some, there are too many posts from people that need additional income to stay on the road.
Trimming palm trees, mowing, fixing others screw ups, picking up other peoples trash, cleaning restrooms, etc all in 100 degree FL weather does not seem like pleasant work conditions.
If you want the comrade and ambiance of a particular park - stay there as a full paying guest and enjoy it to the fullest. If you need additional income to pay for it - maximize your income from your time. Why sell yourself for $8 - $10/hr when you are worth so much more?
A good example was a guy who advertised for people to contact companies in their local area to find excess inventory. When they came across some they notified him and he negotiated a liquidation plan. The "local finder" was paid a finders fee and minimum wage for the follow-up effort. The guy would then try to liquidate the materials through eBay, Craigslist, contacting companies, etc. To ship any inventory he sold, it was the responsibility of the "local finder" to box it up and get it shipped to the buyer for which the "local finder" was paid minimum wage. Not bad for the guy that did the hiring - all his effort was online and on the phone and he never had to take possession of the inventory but still skimmed the "big bucks". Any RV'r could duplicate that program - even if they contacted local companies themselves in the local areas where they are and did it all themselves. Still make more than $8/hr.
Another one I saw was all the opportunities at telemarketing - now there is something that can be done from anywhere you have internet access.
The sense of accomplishment comes from paying your way on an ongoing basis and enjoying where you are and what you are doing.
In answer to your question and post heading.
Many of us have already had our mooment in the sun, and spent years making maximum dollars. Now that we are retired, the money is not as improtant as it once was.
Pleasant work conditions, weather, and a sense of acomplishment are enough. It is all about your stage of life.