Some pretty god points have been posted, but i would like to say/ask the following:
- The known rare records (Salems Wych, Thatcher, Slander etc etc) will not drop in price, that's almost certain since the number of copies is quite limited and the demand high/getting higher...In case copies appear prices are likely to drop, only to get back to normal after these copies disappear once more (many examples, no need to mention them)
- As for the records that have climbed in price recently, Noise, Ebony, Roadrunner etc stuff, sorry but this is just a trend "influenced" by ebay and some buyers that only know this method of adding items to their collections...Please convince me that there are NOT thousands of Running Wild LP's (apart from the obvious rare stuff) around the world.
And mordred, i am not saying a Neat LP is expensive because i may have bought it for 10e, or because it was sold for even more when no one was buying vinyl (anyone into making a large order from Sentinel Steel records' 1997 catalog?). I dont know how many new people enter metal every year, nor how many "leave" it, i am making a guess based on my knowledge of things and the way things used to be or develop if you like...
"Return of the Vampire" from MF was a 20e record. Didnt buy it back then, since i said "its Roadrunner, all MF is cheap". Please find me one now

. BUT, "Dont break the Oath" and "Melissa" is a trend, nothing less for me
My thought is that if an album reaches once or twice a high price, everyone around will "adjust". It's like "oh, "Gates to Purgatory" sold on ebay for 30$, why should i sell my copy in my store for 10$?-the price he had it for all these years...I will sell it for 40$".
How many times records reach very high prices on ebay and AT THE SAME TIME, the SAME record is available for sale on a list for less? Or even on ebay? Ebay is fun and easy to use, but it's NOT the alpha and omega of record "collecting"...
Nightsblood "compared" records with other hobbies and how correct he is. Sure, Metal has other aspects as well, socializing, gigs etc, but as soon as a hobby is based more than it should on a financial basis, things are bound to go down...Sooner or later and not for all, but there are ups and downs. Villain will never be a 5$ record, Black Death as well, but stuff like "Killers", whatever later pressing of "Master of Reality", "Port Royal" the Noise thrash LP's will return to normal prices, that's my guess...
And something for the end. It has been mentioned before. I dont care how someone spends his money, 500$ on Black Death, 300$ on a die-hard Ghost LP, 200$ on a US Metal rarity, 10$ on a new CD by an unknown band. It's his money. There is SO much music to be heard and obtained (in whatever seems logical in one's perception of things, depending on his location, income, personal tastes) that is almost unreal.