I admit I don't know anyone who makes a full time income from solely Ebook writing.
Most writers I know supplement their income with various things - like a mix of short fiction sales, fiction and non-fiction ebooks, non-fiction articles, magazine submissions, fillers - etc.
All of the above are still forms of writing, so the writers I know are actually making decent incomes from their writing efforts but in answer to your question - no. None solely from ebook sales that I'm aware of.
I'm sure there are a few out there somewhere. I'll set Tina the challenge of hunting some down and see what we come up with.
Lee