Luke, have a look at this tourney #1262098547
This tourney used to get 30-40 entrants on avg before you put $100 on gtd and added "New Structure!" label and today it got 106 entrants.
Is it because of "New Strucure!" label or is it because you changed its structure and put a $100 gtd on it? All of it?
Even though this tourney before very rarely got a prizepool of $100, you still put a $100 gtd on it(nice of you) and see the effect.
A $2.20 buy in with no re-entries with $100 gtd gets more entrants than $5.50 with re-entries with also $100 gtd which starts only 1:30 hrs before $2.20.
Increase gtd from $100 to $200 on $5.50 re-entry and put a label like Prizepool Boost or something and see the effect.