I've played on Absolute for about a year now. I have had many ups and downs, but over all i have shown great profit from the site. I see other regular players on the site, that are constantly winning. Just watch the tournament leader board everyweek, you'll see the same players at the top very often.
If your losing, you must be honest with yourself and figure out what you are doing wrong. If I start a small losing streak, I will often take a break from poker(3days to a week) During this time I evaluate my game, and study the game of poker. When I come back I play at the top of my skill and usually end my losing streak. Hope this helps