In addition to Paradox's info above, I believe a person can gain "daily" entrance to the just the exhibit and vendor area for something like $10-$30. At least that's how they ran the event here in Denver.
Also, on the pricing. For the $300 (or $260) a person has access to the entire event for the whole weekend (not to mention the food is first class!). You can go to the guided tour of the National Collection, demonstrations, lectures, and even observe the workshops for the weekend without paying another dime. That is if you are strong enough to avoid the temptations of the vendor area... (Honestly I've been considering flying out to do just that. I don't think I would take any workshops or mess with trying to send trees home.)
As for the workshop costs, my experience in Denver was very good. The trees in the workshops were worth every bit of the cost, usually more. I splurged (for me) $400 on a Douglas Fir workshop with Marc Noelanders. I really enjoyed Marc. He made the entire workshop a learning experience for the paying group, as well as the observers. Each of us took our tree up to the front and worked with him on choosing the angles and future design. He then circled the room throughout the rest of the workshop helping and giving pointers to help us achieve that design. -- That Douglas fir, if I decided to sell it, I'm confident I could easily sell it for a grand or more. Paid $400, now have a $1000 tree. Not too bad! The Spruce workshop I took for $200 the same weekend turned out a tree that is easily worth over $500. I gained a lot of experience form very good teachers the whole weekend. There were workshops for $75 and up, mine were both middle of the road. I don't think anyone has to "waste" money at an event like this. Very often, you get out what you want. I feel like a got a great deal on the trees, and free instruction form a Master in the deal.
-- Vance, I'd be willing to bet that several of your Mugo's are worth a heck of a lot more than you think. It's not really about money... but when you're comparing the price of trees in other areas, you might as well realize that your trees have some serious monetary value, as well as their value to you as your own art work.