Originally Posted by
advanta
There are important situations where tells matter.
The most important tell is frequency-of-response. If a player responds very quickly, then he is very unlikely to have a marginal hand which requires a deal of thought to make a correct decision. A player above micro-stakes will almost always use that time to think.
Conversely, a player who takes a long time to make decision may have a marginal hand. Or they may be faking it for effect. But even if they are faking it they tend to overdo it. You can still narrow down the permutations even if you don't know.
This information, correctly executed, is worth several big blinds per hour, per table.
Note that the bots in current usage don't use this information. It is possible to collect frequency analysis data on every player and develop a much more accurate predictor of hand strength based on this information. You could make a considerable amount of money doing that, probably millions, but it is a lot of development time, frustration and non-trivial difficulty with payment and execution.