This is also a good job buying cheap domains and selling them in auctions, which brings good profit in bitcoin.
There are many people who got profit from do this, but sometimes you're not allowed to resell domain & that domain could be suspended if they found out about it.
Also, most people won't buy expensive domain expect it's really good domain (short or easy to remember)
It is a risky market dealing with domains because it can be manipulated by big companies like godaddy and they can take back sometimes the domain that you bought.
I don't prefer to deal because i don't have much information in domain section, and sometimes domains can be thousands of dollars and good profit in bitcoin.