I wonder, does having a good name for a gambling business to be built have to spend a lot of money?
I think the name is not the main thing in building a gambling business, because when you have good functionality then whatever name you have in the gambling business will have a big impact too because you have good service and appearance and not because of a name. So, if you want to start to build a gambling business at least you don't need to think too much about the name first, because giving a name can be thought of at the end.
It's cost a lot, especially you bought a rare and good domain names, it could cost you minimum of 1 BTC or higher. The weird domain name with a number is very cheap since it's hard to remember and anyone would interested when they read the domain name. No one will want to play on such sites: 23bitc0ins, bestgamblersite1 etc. You need to have good of both name and the site functionality, rather than very good in the one side and sacrifice the other side.