I've attended many of these kind of presentations and you do get a good bit of "free" perks. However, if you are unable to resist high pressure sales tactics you just might come away as a proud new owner. You'll likely regret that somewhere down the road. It's a personal decision. Three free days in a very nice campground in exchange for a couple of hour sales pitch sounds like a fair trade to me.
We spent a week in Sedona AZ once and made $300 in 2 days from the time share sales pitch incentives. We didn't buy a thing but I'm a good "resister". As we are retired, we figured $150/day was not bad pay for just goofing off.