Just did the sums for us .. A trip to Fraser for our family of three for ten nights camping in school holidays , multi permit [ Teewah / Fraser ] barge fees including trailer + allowing the $14 Tewantin ferry and $20 extra cost in fuel to get to Rainbow beach.. = $448.70 ..To get us onto the Island and start the holiday ..
To Moreton Island camping fee's, barge fee's, permit etc, 2hrs less travel driving and $20 less in fuel cost = $620.60 to get us onto the Island ..
Think I still prefer Fraser's extra space over Moreton ....