Such people, I call "chip wasters." They are addicted to playing poker. They do not win all the open games they play ... and then there are the "groups" who gather someplace a series of tables and swap screens or dash back/forth giving buddies at the terminals tips. In which case, you're not playing against one party. What is quite rude about multiple table play is the delays caused by such people at the table wherein you are seated. Whenever you detect collusion, report the IDs, the table, and the hand sequence. They will admonish/pull such IDs, as collusion is not permitted.