you can literally set a gutter in the print settings in any os regardless of what text editor or word processor you're using, though. but also, juggling a bunch of plugins for typesetting sounds like a pain vs a software built specifically to handle typesetting.
i definitely count advertising as part of publishing costs, especially if you're doing print on demand, considering in that situation you have to sell copies in order for any to see print in the first place. also, pod costs a lot more than printing in bulk. i won't call any method of publishing "vanity" because that's a quality judgment that doesn't have any real basis and also isn't grounded in any reality of who has access to what resources.
still in any instance, latex seems more flexible -- publishers use it for typesetting, and so handing over a latex document means they'll fit it to their styles for their formats easily if they pick it up, and if you're self-publishing you can set it to whatever format you'd like, including gutters (seriously this is trivial, you can even do it on a typewriter), and have a lot less to keep track of.
also latex is not linux or unix, it's a language and it's been implemented in a lot of different operating systems including windows and mac os and it's been used pretty heavily since before i was born.