I too, like some people have lurked in this thread from the background - even though I started it, but i feel like jumping in.
I've seen all kinds of things pop up in this thread, from people becoming instructors for tax dodging reasons (how that rubbish even came up mystifies me) to people PADI bashing, to requiring masters degrees to be able to teach and finally, to people biting friends
I am an instructor purely as a hobby. Not for money, not as a a full time job, but because I enjoy teaching scuba, simple as that. I have no Diploma or degree. I didn't go to college, as i simply didn't want to, I had various other things that I wanted to do instead. It took me 3 years, before I did my DM course. When I did it, it took me about 8 months and I worked my butt off. After that I chilled for a while, dived a bit, travelled a bit, after a while did my AI course, which i found very helpful, probably because i had a great CD. 6 months later after some experience as an AI, I did the OWSI portion and became an instructor.
I do feel that the requirement to teach recreational diving is too low- although I didn't at the time! I think a 250 dive requirement is much better than 100, and I feel the 3 year requirement to be certified before going through instructor training is also a good idea- provided the candidate was active in those three years.
I don't deem myself to be the perfect instructor, but i'd be confident that my skills are where they need to be. I don't know squat about tech diving, gas mixes, deco procedures, and have no problem telling my students that if they ask, i'll refer them to someone else, or I'll try and find the answer if I have the resources. At some stage I might go down that road, but not right now. I want to be able to work my skills as an instructor and improve with every student I certify. I learn something new with every class I teach, and when i have students tell me that they're interested in the instructor route, i'll advise them on the way I got mine. Not because its the right or wrong way, but because it worked for me.
Now after that blabbering i'm hungry...
Scubafreak