Only reason to partner with someone on a 50/50 basis might be if that webmaster had a long/proven track record of successfully building lots of quality traffic, particularly high-quality cam site traffic. And of course having experience dealing with affiliates and billing companies would be a plus. But just because someone might possibly be able to build and then maintain one website is not a reason to make a 50/50 partnership.
Of course the webmistress she hooked up with could stop by here and make her case for being worth half of what the site brings in (and yes, after expenses).