This doesn't work long-term, because you're banned long before you make a lot of profit.
I am quite sure counting cards is illegal, so even if you manage to count them you probably won't make a profit, just like Ranlo says here. I could be wrong but I think it is illegal at most casinos.
You're right; it is. It's seen as theft/exploitation.
I thought this was not illegal? Isn't it just frowned upon? How do they actually know you are counting cards as well? Seems rather odd that they would just come up to you and say, hey you have been counting cards we need you arrested?
It's all just patterns, and it's easily deciphered. It's not illegal like jail time, but it's illegal to the casino.
Then I can't use my memory in the game?
How will they discover me, do they have mind reading devices that know when some people is memorizing the cards and when they are not?
You've never been to a casino, have you?