If you OD, rehab will take it up till your natural max. (5025 with a maxed out PI) You'll need DVDs/strippograms/etc after it to get back to 99k happy.
Since I'm asking questions on behalf of happy bookers.. can anyone answer this?
"Saw your thread about the Happy Book in Questions. Do you mind asking also what is the normal charge if you say strike a deal with a newbie to steal your happy for their happy jump? I got the book also but have no idea what rate to charge a friend."