"to be paid after the conference" "All applicants will be notified ... 3-4 weeks prior to the event." How likely is it that this will increase participation,

"to be paid after the conference" "All applicants will be notified ... 3-4 weeks prior to the event." How likely is it that this will increase participation, rather than just wind up just effectively refunding people who would have been going either way? If you apply, and receive confirmation 3 weeks prior; it's pretty much guaranteed that travel/accommodation/ticket prices will all be higher than they are today. Maybe even 1000 EUR higher.