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It looks like you have Business Class set up for this team and that XAwesomeCoopX is currently only on 1 board.
If you add them to another board, they will become chargeable, at the same rate as a single user (around $143.99 a year).
This warning is there to let you know that if you add them to another board, they will be chargeable member, so that you don't add them and then have an unexpected bill. As soon as a member in the Business Class Team is added to more than 1 board, you have to pay the standard rate for them, so this is just letting you know so that you can make the choice of paying another member rate for the Business Class Team. If you don't want to pay the additional cost, I would say that you shouldn't add them to another board.
Does that make sense? Please come back to us if it doesn't and I'll try to explain it better!
This picture indicates that they're already a member of a board for free.
While this is still the case, if you want to add them to another, they will change to billable Multi-board guests, and you (or whoever pays for the Business Class on that team) will be charged for them.
Hope that helps
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