Process of writing fifth Arcadis book

I am in the process of writing my fifth book of Arcadis fantasy book. It has been a arduous, yet joyous, time in my life. I really enjoy writing, and to see people purchase my books are beyond words.
The demographics is from age 12-85. People of that age group, I am told by my readers, love my first two books of Arcadis, as I have not yet published the third.Why? Time constraints, book signings, and needing money upfront are an obstacle but not an insurmountable one. I shall prevail!
If you're interested (and really, why wouldn't you be??) here are the links to buy my two books.

Book One Print books: Arcadis: Prophecy

https://www.createspace.com/5101260

ebooks:                               

http://www.amazon.com/dp/B00Q5OH814

Book Two Print books: Arcadis: War!

https://www.createspace.com/4476436

Amazon ebooks:

http://www.amazon.com/dp/B00U1TO6KK 

Picture Of My Fantasy Book

Don't recall if I ever put a picture here of what my book looks like.

There you have it!

Proof Copies Of My Book Came Today

The proof copy of my book: Arcadis: Prophecy came in the mail today. I expected to open it up, read it and approve it so I can get my book out there.
Well, I opened my book and the typeset looked like someone used a typewriter on it. Very disappointed. Now I have to have it redone.
Another delay. I really wanted this book out by Christmas and it's almost Thanksgiving! I am hoping everything works out and it can be released soon.
In the meantime, I plug away reading and writing.

How Many Ebooks Are Typically Sold On Amazon?

I read a forum where a writer said the average person only sells seventy-six copies of their ebooks on amazon.
While he did not cite any evidence, it made me think. I wonder if that statement is true or false. Obviously some will sell more while others will sell less, but is that disappointing number true?
It would be rude to ask writers how many copies their books sold, but I would be very interested in knowing. I would tend to think writers believe they will sell more, a great deal more. The same holds true for this writer... I wonder.