Shayne Turbo

Could someone please explain to me how land owners make a profit owning full prim private islands? I have seen the prices people are charging to occupy their land and the amount is only enough to cover the $295 per month tier. I suppose if you had a grandfathered tier of $195 you would be making a profit if your sim was full but I just don't see how anyone makes money after paying the $295 tier.