The sockets themselves don't consume any power, only loads actually connected to them. Whatever loads are plugged into the power strip are all aggregated onto the one plug for the power strip. So, it's easy to overload a power strip by plugging in too many high-current loads. If all of the loads are low-current (like DC adapters or small battery chargers, for example), then it's not a problem.
So there is no practical limit on how many receptacles there can be, only on how much total load can be connected.
So there is no practical limit on how many receptacles there can be, only on how much total load can be connected.