I played magic online beta for a good 5 months. I got really good at it when it was free so when it went live I was able to win a lot of tournaments. I was ranked in the top 50 (it helped that I had friends ranked higher). Made about $750 then quit since it was eating up all my time.
Prior to that I did play Magic fairly competitively but got tired of traveling from place to place just to play. If I went back it would be online only.
"And so he spoke, and so he spoke, that lord of Castamere. But now the rains weep o'er his hall, with no one there to hear." - The Rains of Castamere