I wonder if it's possible to (a) make a lifelong actual money-making career of Scrabble and (b) not get completely sick of Scrabble due to (a).
That question is answered in a wonderful book called Word Freak, about the people who are vying for the world scrabble championship.
One of the wonderful thing about the book is the tone. It starts with an air of "hey, lookit the freaks!" but as the book goes on, the author becomes obsessed with his scrabble rating, and by the end he is one of them.
It is a well written, interesting book, and you will love it.
DJS
P.S. After reading it I memorized all the two-letter words. Beware.