Will agree. I never bought anything with regard to how much will sell for if sold. As for a Centennial in excellent condition .... wait for the right buyer. They exist. It is a specialty table.
The reason a picked on those 2 tables is because of the reputation of owning one has a tendency to blind the buyer as to who they're getting the table from. I know of one buyer off hand to paid $12k for a centennial, then when he went to play on it, and he specifically requested the ARTIMUS speed cushions...LOL....he couldn't bank the cue ball 4 rails around the table!!! Why? Because the sub rails were never rebuilt, just the cushions were replaced!
That's just one example, I know of plenty more. There is no such thing as you get what you pay for with these 2 tables! What you DO get however, is the expectation that you're buying a table that'll play comparable to todays playing tables....that is, until you actually get the table, then the truth is in the pudding!!