Quite interesting article on bots here:
You’ll never beat poker robots
Take ‘Dave’ (‘bot-running’ isn’t illegal, but like other bot-runners he wants to keep his identity concealed from the casinos). He is a British computer programmer whose bots have played some 300,000 online rounds. He was approached a year ago by a syndicate of pro poker players eager to build a bot to take advantage of the new money pouring into online poker.
He says, ‘I’m doing pretty well. I have two computer systems, and each one can run four poker bots, and each of those four can play up to five tables at once. At worst I make on average £2.90 an hour at each table. That’s a minimum of £116 an hour if I can get all the bots running at once.