I would like to point out that we can buy English bottled beer from our local L' Eclerc. Bishops Finger, Abbots, IPA, XXX (I think Batemans), Bombadier, HobGobblin, Spitfire and St Peters Porter (my favourite at the moment) amongst some others. They range in price from €1,85 to €2,80. So reasonable in my view.
Those French friends who do drink beer, and they're not many of them that do, like the wheat ales, normally Belgian.
You might do well close to one of the big cities, but then you would probably come up against the Frog and Rosbif chain of pubs that brew their own beer.
And I would like to reiterate what other posters have said, you won't make a lot of money and the bureaucracy will do your head in. But if you want to do it for fun, then why not ? Life's too short.
I'm not a geek, I am a technically aware early adopter