She told us yes,that we would get July 2009 points that we could bank immediately since they would expire July31st 2010,and then we would get our 2010 points on August 1st, so we would be starting with double points.
This is true. You will start your 2010 UY with double points, half of which will expire on 7/31/2011 and cannot be further banked. However, there is still a legitimate benefit to that -- just not what your guide is telling you. I'll explain that below.
The salesperson said this was of a $3,000 value
This is a flat-out lie.
And it makes me wonder whether she's the same guide we have!

Ours happens to be one of the few who will just flat lie to sell something and she's told us some whoppers.
DVC is not giving you a thing -- you are buying those points. There is real benefit to the 2009 points, but they were yours all along and certainly not a gift.
Not only is she lying, but she's very poor at math. I don't keep up with Disney direct prices, so this will be off somewhat -- but if you are paying $110 per point for 50 years of points, you are paying $2.20 per point each year. Dues aren't tied to points, but if they were, you still would not be paying any 2009 dues (you will pay about 1/3 of the 2010 dues). $2.20 X 200 = $440...not $3,000. But she's lying in the first place, so I guess she's not overly concerned about goofy math.
All the talk of these points being ours anyway makes me feel a little foolish, but at the same time, having twice as many points to start with which we receive in two weeks time and planning our first trip as DVC members is exciting, and going to Disney is what it is all about anyway!
Well, two ways to look at it. One, under Florida law you have ten days from the date you sign the final purchasing contract to rescind (cancel) and receive every penny of your money back. If you don't think this purchase is really what you should be doing, cancel.
The other way to look at it is that the banked 2009 points will be a
legitimate benefit to you. You will have twice the points next year. If you don't use them all, you can't bank the 2009 points, but banked points should be used first and you
will be able to bank any unused 2010 points. So in that situation, some of the points can be rolled over year after year...which is a good thing.
You guys need to put aside all of the emotional stuff and just decide whether this
real deal is a good one for you.
If so, put aside the fact that the guide lied to you (but don't forget it) and go forward. If not, take more time to research and start over.
DVC ownership is a long-term thing -- don't rush.