How lucrative is the E-BOOK business

Wow. There's no way a real estate agent would make 8 mil a year if he or she didn't live in a place like Malibu or sold commercial real estate.

There are no guarantees. In fact, just recently an outsourcer sold the exact same book to two different authors and it was flagged by Amazon.

Also outsource what you know about. I read a book by an author who shared on a forum he had outsourced. He didn't know his topic so he did not pick up the errors the outsourcer had made.

It is almost impossible to tell if an outsourcer has borrowed content. It is unlikely to show up in Copyscape. So be sure to work with someone trusted and have them sign an NDA (non disclosure agreement).

Where can i find a professional writer?

Here's the dirty truth that nobody will tell you.

Unless you are writing about a subject that is evergreen, like dating, how to pick
up women/men, health, etc., most e-books, especially in the MMO niche, have
a limited shelf life.

For example, my first MMO e-book sold 200 copies a month for about 6 months.
After that, sales tapered off and eventually, the book got old and stopped selling
and I had to write another book.

You'll have to write a series of books and continue writing if you want to continue
making money at this.

And even evergreen books eventually drop in sales volume. I doubt Harry
Potter books are selling as much now as when they first came out, though I
am also sure the author isn't hurting for money.

Just don't expect to write something and have it become a big seller overnight
and last forever. That is just not going to happen.

Plus, you will have to promote the heck out of the book and also pimp for
affiliates. The amount of work you will have to do AFTER the book is finished
is staggering.

I felt you had a right to know this up front.