If you want a figure as a professional photographer, you should at least bring in a revenue of $10-$15k a month every month to be sustainable. If you do your math right, you should left with 35-50% profit. Now, you can only live off your profit. There are money for servicing, advertising and promotion, etc.
So you divide that amount with total shoot you do a month and that should be your charge per assignment. If you do 10 shoots a month, average should be $1-1.5k. If you do 4 weddings, it should be $2.5-$3.8k a wedding.
I think this is sustainable in today's economy climate but without much left over at the end of the day if you are married with children. Single and still stay at home, sure, you can lower that a little bit if you want.
At the end of the day, as a professional, you need to sustain your living and if photography bring your the income, I think the revenue is very realistic for long term business survival.
So there you are...
I don't consider lower charge photographer spoils the market, but I know life isn't as easy for them.
As a photographer, I want to be able to purchase any equipment that I love shooting, shoot from a nice and comfortable studio of my own. This give me part of the joy of being doing what I love.