Did you read the full article? They are offering more than just the hall.
"Our goal is to use this as a platform
to launch other cost-efficient
initiatives, such as for gowns,
Sheitlach, Shabbos Sheva Brachos,
jewelry and more. We want to bring
down all costs across the board."
Translation: maybe this will inspire other projects. Don’t chuck that HELOC application. You will be needing it.