Bram Stoker, the man who wrote Dracula, was a clever and educated man (he graduated with honors in...mathematics) and the contract he dealt with the publishers of what was originally called "The Un-Dead" and later became Dracula when first published in 1897 was a tough one for the publishers and got Bram a very good royalties deal.
At the times, authors would received about 10 to 15 cents top from the sales of a book, while dear ol' Bram got 20% (altho he wouldn't get anything from the 1000 books sold). We all know what happen after that: Dracula became a hit (and Bram lost the rights on his book for the USA, the reasons for that are still unknown...)
This is the perfect moment to once again state that artists shouldn't sign anything just because a label manager in a record company, or a manager, or a publisher, or a record producer, tell them they are the best thing since sliced bread. If your work excites someone enough to the point of handling you a contract, chances are your work could excite some other people as well and you'll have the choice to sign up something better by making them altering the contract the way you want them.
Of course, we're a...