A site lives from players playing there and generating rake. Offering so called niche games imo can only workout well if there is already decent traffic and fish will get lost on those tables too.
The absolute only chance of them succeding is doing something innovative like the points i already listed above.
If i would have decision power there i would go as far as offering zero raked games for a while. To get all the traffic possible. Then later when traffic is stable i would offer games with half rake as industry standard.
