i personally dont necessarily take the ad on.i mean,if the blinds are slow and its not a turbo,you have plenty of time to double up off some donk who sucks and get the add on for free. if i havent doubled up in like 35 mins,i might take it then depending on what my stack size is like. last summer i came out 9th in a 1A1R 12kfield tourney on stars without rebuying after having entered late and not buying the add on either. i honestly believe you can double up quicker in those type of tourneys cause people play looser due to the fake sense of being ultra deep right off the bat.