There's always the notion, too, that if the prose is purple, perhaps the writer hasn't been exposed to enough education or other writings to offer a different vantage point.
For example, if someone grows up with network TV and movies as a primary influence, rather thaqn delving into examining real relationship,s how conversations move, body english and all that, then the chance for purple prose goes up faster than a Dick Rutan rocket.
However, if the person gets an immersion of things, then the language will be a result of that. And then the writer can make a choice to be "purple."
Again, I think the question of "purple" is about headspace and markets. If you intended that writing to be the way it is, then find the write market and sell it.
Finally, an addendum that seems to fit here: I used to write a lot of things I wanted to write. I had no druthers one what market they would touch and didn't care. However, a friend of mine once said, "Look, why are you wasting your time. if you can't sell it, why write it. It's wasted energy when you could be focused on getting your stuff on the shelves."
And I agree with most of that. Sometimes, you've got to just write something. And if it's "purple," so what? You've said what you wanted to say. However, the move to markets immediately brings up the notion of writing as commerce and I think the rules have to be changed to fit into the morass of publishing opportunities that exist.