$10,000 for a site is a heck of a lot of money, if that figure is just for the price of the software and bundled modifications. To tell you the truth, I have a hard time wrapping my head around it. If you spend 1/10 of your capital for the software, and 9/10 into making it work the way you want it to, it just doesn't sound right... A 50/50 cost split for software and modifications is more within reason in the world I come from.