100% sure its going to remain at 20%, they've got no reason to lower as they have some kind of monopoly.
I feel bad for other marketplaces that have been doing lots of work + offering low commissions because majority of domains are going to switch to godaddy landers this week, regardless of commission structure.
The landers are using genuine godaddy.com URLs, and clicking buy now goes to godaddy cart.
Its great.