As a Robin DR400 owner I regret to say that I would not use one for any enterprise that was intended to make money.
The situation in France is a little different. First of all, aeroclubs are not allowed to make money - unless they are companies which charge VAT. With just a few exceptions, French aeroclubs are owned by the members. Also, many aeroclubs have their own maintenance organisation with years of experience of fixing Robins, and often not much idea where to start on an American SEP.
As for the spare parts support, I fear you're right - although I'm told things have improved a little over the situation a year or so ago.