Boardgames are a tough business to make money in. Anyone can become a designer. The market has thousands and thousands of games out there. Gamers have shelves and shelves loaded with games. They put games they don’t like or don’t have room for out into the used market.
What this all adds up to is that your game has to really fight to get attention. The game mechanics and components need to be really polished. The artwork needs to be very compelling. Thematic games need to have interesting themes and stories. More abstract/euro games need to have really tight rules.
It’s tough!