The demand for foreign and faith based channels via FTA drastically declined with the easy and usually free availability via IP.
With Roku units available at any Walmart and Android Kodi boxes online for less than a hundred dollars, the penetration and availability of broadband in most of suburbia, its hard to justify the cost of the satellite gear and the install cost for a few niche channels. As a long-time installer myself, I will highly recommend against installing motorized systems for a non-hobbyist. The learn curve and technical support requirements go off the chart. K.I.S.S.
Most FTA installers have told me that they rarely get a new install anymore. Mostly only service calls or a rare install of the customer does not have broadband service. Even then, it is more expensive to schedule a service call and replace a LNBF than to by a IP box.
Carefully evaluate the market potential before you invest too much time or effort. Many talented FTA installers who have had significant FTA sales in the past are no longer getting enough work to justify the business license, insurance, etc.