They wont tell you any of the nitty gritty stuff unless you ask. If you ask too many "hard" questions ......then they will turn you over to "their boss", lol. The faster they can "close you", the less questions they will have to answer. Its because those "answers" may sway your buying decision.
Any Disney
DVC salesperson will always tell you that NOW is the best time to buy ....... and it will never be any better ! lol.

Nothing else is important as long as you buy NOW, they will tell you.
We have been on our fair share of DVC tours and had all the pitches. I know its there job, they are sales people and get paid to sell, but we will never buy anything with the hard sale tactics. Dont think Disney isnt about the hard sell ......they just try to do it in a nicer way. They will never give you any info you dont need that may possibily sway your decision (like a UY question). They are all about the impulse buyer.
Now, you really must do a lot of your own research .......just like you are now. We are doing the very same thing, btw. We have gone so far as to rent DVC points for various resorts we might want to buy at. We have been to, stayed at and/or walked around and visited every resort at WDW (except SSR for some reason !

).
Take your time, and do a ton of research. I would highly recommend renting some points and doing an actual DVC stay to see if you like it. It is a little different than a normal WDW resort stay (but it can be better depending on your expectations, and how much money you can save).
Did I miss the reason you are buying direct ? I know somebody always has to buy direct or there wouldnt be any re-sales. Only a few reasons you (or anyone) should think about buying direct is if they need financing (very easily), and want to get the points NOW (its a quick turnaround buying direct). I would urge you to check into the resale brokers. You can save easily 50% off (not VGF) of the Disney "buy in Price" going the resale route. You dont really lose any perks buying resale.......at least nothing thats a good value. Using points for a CL room or a cruise is not really the best use of your points.
Anyway ........we are in the same boat. Just about to buy in, and have learned a lot from the wonderful DVC owners on this board (and others).