As a seasoned web designer/developer I’ll offer this - it all comes down to what Wix will do out-of-box. Honestly it’s so constraining you have to have some very vanilla needs to use it for growth.
My recommendation is that you take a hard look at the business solution you’re trying to solve and hire a reputable developer/designer who has demonstrable capabilities at solving your business problem. And make sure you’re going down a direction that will recoup your expenses. Otherwise tailor your need to what Wix can do.
A good developer will charge you 5K minimum. 10K doesn’t shock me.
I agree with your post. Thanks. I was figuring somewhere around 10k but didn’t have a target in mind or knowledge on how designers price the projects.