The plus side of this arrangement is that you presumably get to travel through Greece with a group of like-minded people led by someone you know or respect. The down side is that the expenses of the trip for the "leader" will be charged back to the other participants, resulting in a slightly (or sometimes, substantially) higher cost. A profit for the promoter is also built in to the cost. If the person leading the tour is worth it to you, these trips can be fun and the extra cost to be part of this group, if moderate, may be worth paying. But watch out - I've seen tours like this that are more than double what the ordinary traveler will be paying. How to find out? Contact a travel agent or tour packager and ask what a similar tour is costing, minus the "celebrity".
