"IT Depends"....But generally in PO tourneys u need atleast 1200 in chips to make players think twice about calling - but some plaers call anything when they have you covered - so maybe AK isnt the best against them - 99 or better is usually gd enough to give them 3 core outs. But in the blinds - take ur 60/40 hands all day with all-ins. In the end the pay off by the number of folds you get - if your 40% - the folds you get will most likely even the score or get you positive over time. If your goal is like mine most of the time - winn LLB's - you might play tighter - if its cash - play looser/more aggressive. IF it's for fun - like making final tables - play somewhere in the middle while trying to read the table as best you can.