That's not correct. It's a flat 1% of revenue regardless of the number of Post-Open software packages used. (From the slide at 13:30 "The same fee whether you use 1 Post Open program or 1000.") The organization that receives the payment is supposed to handle splitting up the revenue among software package authors, so it does require auditing of all usage.
>>Throwa+(OP)
That helps with my final point but #1 and #2 are deal killers as well.
This also places an undue burden on the payment receiver as they have to get into the business of running enterprise audits to find out who is using what.