I've been writing full time from home for about 2 years now. It's been very rewarding financially, but is also very stressful at times. It can be mentally stressful and rewarding all at the same time and it does drain you when you're very busy writing. But, it's well worth being able to stay home with my kids and to earn great money while doing so!
The key to doing this full time is you have to write a lot... especially if you're doing Web content writing such as what's offered on Constant Content.
Make a goal to write 5 to 8 articles per day 5 days a week and submit them for requests and you'll see a lucrative income with CC if the customers like your writing. Choose subjects that you enjoy, but don't be afraid to dive in with other subjects that seem less appealing. These can sometimes be your best subjects once you learn about them.
If you can write very good quality articles, then you won't have to worry so much about price wars. Charge what you need to charge to make a living. If the customer doesn't want to pay for quality, then leave the article for another customer who's willing to pay for what it's worth.
I found since my writing career began that most customers that are easy to work with don't mind paying more for quality writing.
Good luck... and hope this helps!
Candicep