All these men want is to be themselves and write romance. They don't want to hide behind women's names. They want to be accepted. With the variety in romance today, it's not inconceivable that there could be stories written exclusively from the male point of view. A quick scan of romances that are out right now show that most are written from both points of view.
Most women like to read the male point of view in a story.
It shows emotion and depth in the man. There are no statistics that tell us how many men are out there reading or writing romances. The market could be a viable one. That is anyone's guess. For now, there's Harold Lowry and Jim McBride.