Let's say you buy 1 account as STD and invite more than 10 people to join the board with you as a free account participants.
You can subscribe to Trello Standard/Premium in your workspace. It will be charged based on the number of Workspace Members or Multi-Board Guests.
So if it is just you as a premium/standard user and the other 10 staff are single-board guests, you will only pay $6/mo or $60/yr
If your members go to more than 1 board, you will have to pay for their subscription
if user and the more than 10 staff are single-board guests, how to charged
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