I have worked in the trades as an electrician and then became an estimator/Project Manager. Most are small businesses that are barely hanging on. It is often not a path to wealth. Many of the smaller businesses are being bought up by private equity now to drive up prices. The tradesmen are not getting wealthy and typically will not become wealthy. Licensing a business is different than the license a tradesman gets. Rules vary by state and are often require the approval of your would be competitors, regardless of demonstrated skill and time in the trade.