True, divorce is widespread everywhere these days... but you do not see people advertising themselves as "divorce lawyers" in mainland Europe, the way you would see it in the US.
While people in Belgium are definitely open to the use of English, I am not sure how far a lawayer in that specific sector would advertise in English. I would at the best see a possible niche for a lawyer targeting the international community in the Brussels area. But I would be very surprised to see such a domain name selling for a good price.