Thats one great way of getting out of a "owners update". But if you have to go through the 2+hour long sales pitch, property tour, and then have the manager come in and put more pressure on you.... Just tell your sales rep 15min into his pitch that your ready to buy now. You have been on other tours before and you now are ready to purchase. You think the rep is gonna stall getting the paperwork/contracts going? And, if you are smart enough to know that their is a cancellation period, as soon as you leave from your tour you cancel the contract.
They don't get into the sales pitch, however, until well into the second hour of your time . . . so rolling over to buy (and later cancel) is pretty much a waste of more time than necessary.
When I've wanted/needed to stay longer, I have . . . when I've needed to be out of there quickly, I have succeeded.
I would never advise agreeing to the purchase knowing you're going to cancel just to cut the time involved. The paperwork and going through the "contracting dept" (or whatever they call it) will take as much time as just gutting out and staying true to "NO" when they try to sell you.
Another good way to get out of there is to start talking rather loudly, about the resale market when there are other potential buyers within earshot. We were in Maui once just having a chat about that while our sales rep went for a cup of coffee for himself. When he returned, he had just five words for us "You may be excused now" . . . and he took us to the gifting counter. We're pretty sure they had microphones somewhere in the vicinity of where we were sitting.
If you schedule early enough in the AM that they still have chance to make a sale later in the AM by cutting you loose, they will not waste time on you.