Still it's not the scam that passes for wage in the US (especially considering cost of living and other expenses). And Paris can be anything, from expensive neighborhoods to project suburbs.
If you're paying a relatively high hourly wage to all of the staff, it seems unsurprising that you'd not want to be open during times of low customer traffic.
Honestly, this seems good overall; there's no more sense in having low-paid waitstaff hanging around hoping to get a customer table that will tip than in having a restaurant owner keep the restaurant open while paying the staff a reasonable hourly wage.