Western men just get a greater feeling of reward interacting with women than the other way around
I don't think this is necessarily true at all.
What might be true is that women feel they have less interactions with men where they feel in control of the conversation and like they chose to speak to them though. Culturally men are the approachers, the predators even, and often those sorts of men who do approach tend to want to dominate the conversation and make it about themselves. Their attraction, their interests etc. But that's probably because those sorts of men aren't the guys who think "Maybe that woman doesn't want to be pressured into interacting with a stranger". When it comes to completely consensual conversations with awesome men (and there are many of them) who genuinely have similar interests and aren't just in it for themselves, I am sure women get just as much a feeling of reward from the interaction as men would. I think if you were to have a camsite aimed towards women this would be the interaction you would be needing to get.
Remember that perhaps young women get approached by men all of the time, but for many women above 40 having a young workman round is exciting for a flirty chat. In my aunts own words talking to my Grandmother: "It's great! Because they just see you as an old woman and so there's no pressure or threat, so you can have a lovely flirt and chat without it mattering at all!"
My Aunts words rather make me think there is a market for interactions with young men where absolutely nothing needs to happen, where they feel safe (i.e. with the internet between them). It's fairly commonplace for us to believe women aren't that sexual or don't have the same desires and needs as men, but research seems to show this just isn't true. Jesus, the sex toy industry pretty much proves this isn't true. Yet there isn't yet a great market for the types of stimulation women want, and possibly not because there isn't a desire for it, but because culture tells us that there isn't so no one is doing it. Just think though of all the women who have skype sex with their partners or dudes they fancy, is that just for the man's benefit? Do lesbian couples not do this? Clearly there is something there which people seem to love to ignore.
It would likely not need to be sexual, it would be like the difference between watching porn aimed at men and a romance/sex novel aimed towards women. Think emotional foreplay with the fantasy, and I guess just attention and fun. Quite possibly a fun community environment similar to MFC would work. I know for me the reason I don't view male cam models is because of the large amount of disgusting dudes who just want to jerk off in front of women. That's such a turn off for me that it would take too much energy even trying to find a good guy. Also why would I pay for something so many dudes would give me for free? Essentially an arrogant self-indulgent dickhead who only wants to jerk off and doesn't give two fucks about female pleasure. No thanks.
But if there were a site where I'd be guaranteed that you wouldn't get any douche canoes and you'd only get genuine cam models who care about providing a friendly, chatty interaction with a bit of teasing and sexy stuff thrown in that's going to excite the viewer rather than throw it all out there like a piece of meat at a butcher, well that is something I might be able to get on board with. I seriously think this will become a thing one day, it just needs to be marketed right. Likely it won't make the same sorts of profits as a big cam site, but at the end of the day a small start up is almost certainly never going to take over and get to the level of MFC or Chaturbate. By having a go at entering an untapped market you might actually hit gold. Remember, for every dude wandering around the internet feeling lonely, there's a woman who's not being paid enough attention to and is just as lonely, yet has no where to go.