WealthyBot is using an algorithm that will first trade roughly 18% of the amount you stated in the trader. It will then fluctuate this percentage based on market conditions. The amount your trader trades with can be regulated by how much you tell your trader you have available to trade.
You can tell your trader to trade 2000 USDT even if you have 10,000 USDT in the exchange. Soon this setting will be completely customizable. You will be able to tell WealthyBot trade "x" percent of my total value.