You can be profitable in any business you do, but doing a business you have a passion for has more chances of increasing your net worth. You're dam going to spice it up because you love what you do and thereby putting all effort to attract more sales in your business.
Most successful businessmen are people who do business they have a passion for, take for instance, Elon Musk, Markzukaberg left school to develop Facebook App and Bill Gates is successful today because they have passion for what they do.
This is a kind of blessing that your passion becomes your job or business. There are not many people who enjoy that blessing. I dont love my job but I have to do it forcefully to get pay for daily living. I wish my passion becomes my source of income like I love to write technical articles and if that becomes my source of income then I can perform better in that sector. You cant excel in job or business where your passion is missing. You wont find any example where a businessmen got success by doing it forcefully.