I have Multi Tabled in the past but found it hard work! I don't play Poker in order to make money, I play On-line purely for Fun and the pleasure the game gives me, and the time for practice so that when I play a Live game I am confident I know what I am doing.
Poker is definitely a game of skill, but there will always be that element of luck involved as there is in any game of chance, otherwise nobody but the best would be playing.
I have in the past had as many as 6 tables open at the same time, and even that is small compared to some players who play as many as 9 on each screen, and have 2 or 3 screens going, but it's not what I want from Poker!
I play for the fun, pleasure and enjoyment the game gives me, if I don't get that, then I don't play.