How do Artists Sell their work in Paris?

Here I am last week at an art "exposition", over in Paris, France. I was staying in the Marais area, which is full of quite sophisticated art galleries. But this was something different. 
In a large room named Halle des Blancs Manteaux, 
 (Hall of the White Coats) there were some 60 artists exhibiting their work for the weekend. To do this, they had to pay the promoter about $1,000 euros each.  A euro is about $1.15 each. So we artists always seem to pay to show, it's just quite pricey there.
I had a fun time going around and talking with various exhibitors. Speaking French is a big help. We had literally stumbled onto this opening on a Saturday evening. It closed at 8pm in the evening. Maybe to  go to eat dinner.   They
do that later over there. Have you ever tried to find a restaurant serving food in Sedona after nine pm?  Believe me, it doesn't happen here in rural Arizona.
The artist with me is named Hortense Varillon and she had the most cunning images on glass, almost in a shadow box. I had not seen anything like it and we got to talking. Funny how some things are universal. "Are you selling", I asked and got a spiel about how difficult it is to sell art today . I found this the common complaint from other exhibitors in the Halle, and the level of work was quite high. I bought her a beer, since I was not the optimum art customer this trip.
So how do artist try to sell their work in Paris? They do  whatever they can do, just like us.