I don't believe that this is a good premise for a book. Much like who the sexiest man/woman is this year is that we see in magazines, it's all subjective. Some games that were instrumental in making great strides forward developmentally weren't necessarily great sellers, and some of the best sellers were (in my opinion) only so-so games. The book will make money, but the only good it will accomplish will be to inspire a great deal of discussion as to why certain games made it and certain games were excluded.