I don't think it's for anyone other than the organisers of the tournament to comment on what the prize money for men or women ought to be. Their job is simply to offer enough prize money such that it attracts the quality of player and the quality of tennis that they're looking for. They seem to be fine with it currently, so it's all good.
If male tennis players think they're not getting paid enough based on the revenues they bring in, they can always just decide not to play in that tournament. The risk of that would put pressure on the tournament organisers to increase their prize money. But currently it's not thought of as such a significant risk.