Very interesting that you both brought this up, as it was discussed at our house as well. This is a much deeper scene if you have ever experienced anything like it before (and I hope you haven't).
The big boss at our company bought a new boat and invited everyone he knew to have a launching party. We noticed right away the only people there were people on the payroll.
It was so sad that we hoped he wouldn't notice this, but it was pretty obvious. I think this scene did a nice job of showing OJ as he begins to realize that the only people left around him, like the waiter, were paid to be there. And when the money runs out, those people will be gone as well.