maciec,
DVC is not for everyone; it's more cost-effective if you would normally go to WDW at least every other year (which you said you would do) and if you would normally stay at a deluxe or moderate resort.
Maybe Humberto was looking out for your best interests based on your vacation patterns? Still, that wouldn't excuse his rudeness (if he was rude to you).
When I first called DVC last June the guide who was assigned to us also asked us some questions, and based upon my answers it didn't sound like she was too thrilled either. We didn't purchase then; we ended up buying a resale in February after taking a trip to the Boardwalk area in December. We also have a new guide (she was the guide assigned to the original owner of our resale contract) and she has been very pleasant to deal with.
If you're still interested in DVC, call them up and ask for another guide. Also ask them for the information packet (video and a booklet, if you don't already have them). Read over some old threads on this forum for more information and ask questions if you have them. There are a lot of DVC members on this board who would be more than happy to help you out!