Justifiably, any attribute or factor that is known to be influencing prices, is doing so as it leads to demand. On how easy basis of such factor demand is raised and thus the price. Hence, these domains of media like segments as you say like http://www.hindi.media gain worth from the same factors that lead to demand. When price is enhanced or goes premium, the domains are thus known as premium domains.
Just because something is legal does not make it ethical. While things that are legal can and often are ethical, there are practices like domain name flipping that are not ethical. Buying a domain name without intending to use it to make profit creates an unnecessary industry which costs people money and reduces general productivity and economic growth. This is the same with all practices that cost people money but do not contribute any value, most notably corruption. If we eliminated such practices our economic growth increases and general wealth is increased because our money is paying people for things that add to our lives and our communities. This does not. Evessariky reglect badly in people who choose to engage in such practices, but is a result of regulatory failure.
They see a domain’s price tag and they can instantly tell whether it’s under or overvalued. This is probably the most important skill one should have in this industry. Neil Patel has an interesting related quote: “The most important thing to remember when buying sites is that you always make money on the buy, never the sell.” In order to successfully do this, you must be able to spot undervalued domains. This is what will ultimately translate for you into a handsome profit margin when you get the opportunity to resell the domain for its “real value”.