That's why I said "you control a lot of things like, what you sell, your target market, your marketing, you can adjust things if something doesn't work, etc..." Opening a business isn't something you just do with a bit of preparation, you study the indutry and learn the ins and outs, you research, you insure, you make plans. Sure, business is very risky, but it is the kind of risk that you can reduce with proper preparation, which you can't really do in gambling.
Definitely true, that with the right specialty business gets controlled to fetch good results which relies on a certain natural phenomenon; mass desire. If a business owner is able to understand what the people desires, they'll probably succeed. But it's not that simple, and above all, preparation helps a lot in achieving such goal. All of that can't be in gambling, but if a player stays actively in watch of their habit, they can't tweak the results, but can control the way they spend. Just like in business.