On the other hand. I do not think that this progressive game itself is the most profitable game, but it probably gives a revenue boost for the casinos when it has such a high player volume. And Net Entertainment casinos have most likely attracted many new players because of this jackpot. Players who also tries other and more profitable games.
This game has proably already reached the point of being +EV for the player. I'm sure casinos still make their odd 5% or so from each bet though. The base game return excluding jackpots is probably around 90%.
Pure speculation, of course
Freddy