Just to clarify for everyone.
With Ari Ben, one person is flying under the hood (simulated IMC), while the other pilot acts as the safety pilot, on the 100 hour scheme, 50 hours is flown under the hood, 50 hours as a safety pilot. Under the FAA rules you can log the safety pilot time, under JAA only the handling pilot can log the time, hence of the 100 hours, 50 are still legally "loggable" under JAA rules.
But as mentioned for a charge of $20 dollars more all hours can be logged as P1 if you are a JAA hour builder. Therefore I assume that the equivalent safety time is sold to an FAA hour builder at $20 dollars cheaper than the normal rate.
Out of interest I assume all posters on here are trying to get the 40 hours p1 multi needed to meet single pilot ops requirements.
I have heard at some air taxi companies it is possible to get pilots assistance work and build multi time by flying dead legs/empty sectors (was offered such a position but the company only lasted two months before I had a chance to start the job).