Do a little research by reading past posts in this forum. People have paid much more than $5K for a week in the Hilton system -- actually, $5K is quite a bargain! With the HGVC point system, one of the main benefits is that it is very flexible, and you can stretch your "week" into several vacations, change to different sized rooms, stay for non-standard lengths (doesn't always need to be 7 days), convert to hotel points, bank / borrow points from year to year, trade w/ RCI, etc.
In a nutshell, if you don't value those benefits then HGVC is not a system for you -- you would be better off sticking w/ the traditional timeshare "week".
Kurt