A very interesting thread with lots of food for thought. I am not a SAHM but find I have similar feelings to Emma (triptych). I always had an interest in photography growing up but within my family dynamic (and thats a thread all in its own) was not given the opportunity growing up to study the art including the how and why (yes I could have done this earlier and on my own without family input but I didn't) then as time went by life goes on and you grow up and end up with a family. Now that my daughter is a teen and I have found and lost myself many times, in the last 2 years I have purchased a DSLR again and undertaken a few courses and to date now have a general hold and understanding of this craft.
I do have the goal to become a Professional but I know that this will take much time and yes I have a business plan, ABN, website, full insurance etc to run this separate to my normal life and income. I also am out with my camera every week at least 3 times a week taking photos, studying, learning and I have a 10 year plan and hope to be able to turn this into something great given time, encouragement and guidance by people within the industry and others alike. I hope that I am setting myself up to succeed but if I don't to me that's ok, I get pleasure out of photographing people, places and things and that has and will never change, but I would like to have the opportunity to get out from an office and behind a chair/computer 5 days a week and earn a great living from what I love!
PS Since buying a DSLR 2 years ago I have invested quite a lot of money in gear including a second body