You can charge a fee for others using your UTXOs to coinjoin with. Makers with large fidelity bonds (in size and lock time) get chosen more often. Being ablento make 0.01% of the coinjoin size multiple times a day. It's hard to tell, but I estimate that the largest bonds can make over 2% yearly yield in their total locked+available Bitcoin.

Here is an instance of the orderbook where you can see the bond values and fees: https://joinmarket.sgn.space/