Centralized exchanges cause where you will have enough liquidity for higher amounts for almost every tradeable coins and tokens. Lack of liquidity is the reason why you can push your trade limits to higher amounts but beware while doing arbitrage trading its almost gambling and price changes too quickly since its the nature of cryptocurrencies.
Its not gambling. There reason why crypto prices are the same on every exchange is made only by professional arbitrate traders. There are no professional gamblers. You only have to do it wise and with good softwere.
i have dm you
I would rather like to answer you here so that others can learn too.
In a DM you were talking about super illiquid trading pair on ghost town (AKA uniswap V2) where total daily volume according to CMC = 50$. Most likely slippage was the reason why you did not earn on this trade.