Yes i agree to some extent but with me at least im not collecting for their 'value' or 'what there worth' or an investment...im buying the machines i want in the condition i want and what i can afford right now.
Sure i would be most happy if in 10 years time they held there price,but if not im not bothered either as its the machine and enjoyment of having it that i like over it being an investment.
I have a couple of friends that have been collecting over 10 years and both have all if not most the A grade titles and they got them at sickeningly cheap prices compared to what i have to pay NOW to own.
As long as you pay what your happy to pay i dont think the bubble burst will hurt to much