Part of writing well is learning to revise your own work.
If you get a publishing contract, your editor isn't going to make those changes for you: she'll just point out the problems with it and in some instances, suggest solutions. It'll be up to you to resolve those problems and implement those solutions, and if you've been too busy to learn how to revise your own work you'll be in trouble.
Revising isn't wasting time: it's an essential part of writing. And if you find a "pro" willing to be hired to do it for you, you'll be wasting your money. Good editors don't do that; bad editors can't.
i guess I'm in bed with hack on this one....the argument about editing seems even worse, but in the same vein as people who bemoan an inability to write a query letter....if you want to be a writer, there's more to it than putting a story on paper. If Justin Verlander said all he wanted to focus on was pitching, because that was his strong point so fuck fielding or batting, you'd think he was at best myopic, and at worst a preening little snowflake. To me, not learning the skills to edit effectively, especially if the arguments are things like "time spent," is much the same.....at the very best you shortchange yourself as a whole, for dubious gain.