For teams that only have one member, it may not make sense to the user to check that their nominal take is set above 0.00, because why look at takes if you're the only one taking? The assumption may be that all donations will come to you automatically.
I suggest that the nominal take be set at some reasonable amount (10? 100?) for the first team member. Then when that team member goes to add a member, a notice could be displayed that shows the takes table and suggests modifying this value.
For teams that only have one member, it may not make sense to the user to check that their nominal take is set above 0.00, because why look at takes if you're the only one taking? The assumption may be that all donations will come to you automatically.
I suggest that the nominal take be set at some reasonable amount (10? 100?) for the first team member. Then when that team member goes to add a member, a notice could be displayed that shows the takes table and suggests modifying this value.
See, for example, https://liberapay.com/SocialCoop/income/.