How Does a Market Maker Profit from the Bid-Ask Spread While Gamma Hedging?

A market maker profits from the bid-ask spread by acting as a liquidity provider. When they Gamma hedge, they are continuously buying and selling the underlying asset.

They aim to buy the underlying at the bid price and sell it at the ask price, capturing the spread as a profit margin on each transaction. The net profit from the spread must be greater than the accumulated cost of Gamma risk and transaction fees.