Scubajoh,
I too "ran away and joined the circus" last year to go work and teach on a liveaboard running the Bahamas. I have enough stories to write a book about the experience.
I left a very lucrative yet unfulfilling IT job to "live the dream" and make a living doing what I love. Bottom line was a 100 hour+ work week for $100 US plus tips. Oh, wait... AND room and board.
Here is the harsh reality of the diving for dollars business, as with any "fun" job there are tons of people sitting around thinking the same thoughts you are, unfortunately most of them are young, have no responsibilities or bills and are willing to work for nothing to avoid going to college or getting a real job. The overseas dive industry is keenly aware of this fact and exploits it. If you want to improve your tan and dive a great deal, then the overseas dive industry is for you. If you want to make a living, stay on land with your "real" job.
Yes, there are a few folks out the making a go of it, they are in the perfect spot teaching a lot and have carved out a niche for themselves. The overwhelming majority of dive professionals out there worldwide are in the business because they love it, not for the money. I saw a lot a "mid-life career changers" such as myself come and go last year for this very reason. Most of them did not last more than a week or two before they jumped ship and RAN down the dock. By the time I was on the boat for 4 months I was one of the "old guys" on the crew.
The dive industry is very romantic and IDC places all over the world seize this concept to sell you the dream... watching beautiful sunsets while sipping pina coladas on the beach. I saw a lot of beautiful sunsets while filling tanks, scrubbing decks and doing dishes. If you are willing to bust your butt and work long hours, slave over hot tank fills and kiss the asses of greedy dive operation owners then you might make a go of it.
Not really trying to discourage you, just giving you the straight inside info from someone who has been there.
Needless to say I'm back in the IT business full time now, but I do still dive / teach just about every weekend now in sunny South Florida and it's a nice supplement to my income (basically I use "dive money" to buy more gear like everyone else).
If you are a full time teacher, you may have the perfect setup. Hook up with a dive operator during your summers off and have fun while keeping your full time gig. Better still, find a local university that needs dive program and take those kids to the bank - they can afford it.
if you have any questions, feel free to PM me.