Quoted from ovfdfireman:

You are entitled to an opinion, my opinion is simple.
Much like Cactus canyon (incomplete game), the laws of supply and demand kick in. As less and less of these become available, people will have to pay more to get owners to let go. Extremely low production number fast forward this process.
The way it works is simple, the first 1200 people bought cactus canyon for probably $3000, some international some domestic. Some routed, but the very nice examples become very hard to find. Pretty soon there were enough folks willing to pay $5000, then as more collectors entered the market they had to pay $6-7000 to get these others who searched and over paid to let go of the games, now you have a group of people with $7k in their cactus canyon, probably even restored something and added extra money. Next group has to pay more to get these people to let go, so maybe $10k and so on and so forth. Same with MM, AFM and all the classics, but CC and BBB being low production illustrates the the laws of supply and demand perfectly. If they are hard to find, you have to pay more to get one.
Not to mention, at the rate new pins are going, 10k may look like a bargain 2 years from now.