Is that even possible to earn 50$-100$ every day with spot trading? If yes then what methods you are using and how do you manage your risk?
@OP, Yes, it is very possible; you can even earn more than that, just up to the amount that @MK4 stated, but what you must know is that in trading, your profit is not always certain because the crypto market can really be very volatile and could go against your predicted price, which can result in a loss on your investment. Another thing to consider is how much you are willing to risk, because that will actually also determine the level of your profit, because in Investment, the higher your Invested amount, the higher your profit. Since you said you want to trade sports on CEX, let me give you an example.
Example: Yesterday, Bitcoin went from $29,300 to $30k+, so let's assume you had $58,600 in fiat and you bought two pieces of Bitcoin at $29,300 each, held it for some hours until it got to $30,120, and sold at that price. Your profit would have been $1,640 just yesterday.
Assuming you had $117,200 and invested in 4 bitcoins, your profit would have been double what is stated above in one day.
Also, if you are dealing with an altcoin, perhaps the price for one of those coins is just $0.21, and you bought 60,000 pieces of the coin for $12,600. Then, let's say the price of the coin just moved from $0.21 to $0.23, then your profit would be $1200; that's just one day's profit.
I have only calculated the profit side of the market, but assuming the market goes against you, then you would have some loss on your investment.
So, my point is that you can make even more than $50 in a day, depending on how much you are willing to risk.