I would have to agree with the people that say Dorney doesn't market to the same people as SFGadv. When you go to Dorney it can be packed in the parking lot but when you get in the park nobody is riding the coasters. The longest lines you find are for the Wild Mouse coaster and the other smaller coasters and flat rides. This is because Dorney markets towards families.
When you go to SFGadv all you seem to see is large groups of teens that for the most park came in on bus trips or in large groups. You don't see very many families at all. The park doesn't seem to offer much for families.
Dorney markets better to families because they include there waterpark with entry to the regular park. Just look how large of an impact such a decision can have on park attendance. SFGA did that this year and set record numbers for attendance.
Basically what i'm saying is comparing Dorney and SFGadv to eachother is like comparing apples to oranges, they just aren't the same. In my opinion they don't have any real competition between the two parks. I would be curious to see if there advertising radius' even overlap eachother.
Can a local answer this question; Do you see both Dorney and SFGadv commercials if you live in a netural location between the two parks? Or do you see Dorney commercials in NJ and SFGadv commercials in Allentown?