Probably Bunim's obsession with youth made her believe that dimmer lighting would somehow make everyone look younger, particularly the older cast members. Who knows?
James seemed much too chauvinistic to rely on Barbara to maintain his lifestyle and I suspect Barbara was attracted to that aspect of him.
Before Hal, Barbara seemed to gravitate toward these chauvinistic types, brimming with machismo. Maybe, not so much Brian, although the more he stood up to her and told her off, the more she seemed driven to keep him in her orbit. Tonio and Duncan were both brimming with machismo.
Also, James liked to live on the edge. A quiet life with the 'missus' would never have appealed to him for too long.
It kind of became a running joke, how many businesses Lisa had but I kinda loved that that she low-key had her hands in all these different companies. Every now and then, she'd exert her influence through one of her ventures, not in overt ways like Lucinda but in sly ways.
We don't see much of that in today's daytime soaps.