Well, you take your own bike and pay your own way. But there's a guy going who did pro tours and they have a landrover. It seems like an open invitiation on the XT660 forum.
I guess it's slightly weird going off with a load of random people from the internet but it'd probably be a good crack and it'd be easier than going alone or without the experience / backup.
I'm tempted but I think it needs 2+ weeks and I probably don't have that spare this year.
Here's a link about the last one they did. EDC in Morocco on a Yamaha XTZ660Z Ténéré....amongst others... - ADVrider