This is not something we currently want to do, it is just worth exploring the impact of doing it.

Small fee would help relieve some financial pressure on the event.
Small fee would help us having an accurate head-count in advance of the event.
Scholarship recipients would not need to pay the fee

Question:
Would WMF teams need to pay the fee? How does it work for Wikimania?
Would other affiliates need to pay the fee? How does it work at Wikimania?