Wealthybot only takes a profit when you receive a profit from liquidating/closing a position that has a profit margin. We take our portion of the profits in "credits" 1 credit is the equivalent to 1 unit of currency. 

WealthyBot will remove 20% of the profit you make in credits. You must have credits to cover the profit of your liquidated position or Wealthybot will not make the trade. 

For example if you have $20 in profit Wealthybot will take $2 in credits or 2 credits.
If your account is in Euros and you have €20 in profit Wealthybot will take €2 in credits or 2 credits.

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