I have a question. Don't you also need a large bank to support bets?
Let's say you are starting, and don't have to much guys using your site and betting. Doesn't that mean that you need to support the bets yourself?
Here is an example, in a game A vs B, where A is the favourite and the small amount os customers that bet with you are backing A.
If you want to accept the bet you will need to pay your customers if B win right?
So given this, how can you say that anyone can afford to start a sports-betting business?
I know you say website, but what I'm trying to say, is that anyone that can support the business itself will sure be able to support a website, so the price is probably irrelevant I guess.
You can match bets as per bank roll and there is min amd max bet option which you will set as per your bankroll.
You can earn sure money by matching bets by taking 0risk by using sites like betfair or other exchange sites.
So anyone afford to start it only thing you need ia platform for getting players/marketing affiliates tool and leaderboard will help you in begining and later time you can use g ads bing ads and other marketing methods.