Vinyl

I'm unsure if you understand the pricing in Discogs. Discogs does not set any pricing, the people selling there set the prices, it's like eBay. Sellers on Discogs range from individuals like you and me to music stores selling their inventory.

The prices can be whatever, but normally are based on the availability of records or CDs, but mainly records. If a record is out of print and highly desirable the price will reflect that. If a title is not desirable or you can find copies in the wild easily then the price will not be so high.

For sure anything rare or was only issued once or limited release will be very expensive. I have many, many records I paid $30 for that now list for $100-$300 because the record has not been reissued again or that variant was limited, almost all of my early Riverside albums are like that.

Pink Floyd~Pulse was a classic example. The 4-LP box set was going for $500 until last year when it finally got reissued by Pink Floyd records and the price dropped to $100.....Then all those new issues were sold within a month and the price jumped back up to $300 as a high. They were sold at $99 from the Pink Floyd store, but now if you want one it will cost you about $200 for sealed.

That's how free trade markets work! 

Even capitalist countries are civilized, brother, where people are supposed to think about proper ethics - but I agree that it's much more complicated than that. 

I actually tend to prefer CDs to vinyl, mostly because CDs are more versatile, less of a pain in the ass to take care of, and, most importantly, considerably cheaper than vinyl. I only prefer vinyl if an album is mastered horribly on CD. But these ones are somewhat hard to come across, especially on CD, so I took them as they were well-ish priced ($38 for the entire haul including the three vinyls and one CD). 

Someone(s) here seem(s) to have found my recommendation to be fine, as the only good offer from USA, coming from the record company, is now sold out, as it must have been their last copy(ies). If so, I'm happy about it, but anyway there's now only one more not-expensive offer left, from Germany. 

Plus one in Japan of the Japanese release ( https://www.discogs.com/sell/release/14672071?ev=rb ) - an obi-insert alone seems to be added to this "release", so the total is still only 500 vinyl copies of this album worldwide to present day.

Which original release album should I buy next?

Kraftwerk - Autobahn

Gryphon - Red Queen to Gryphon Three

Queen - A Night at the Opera

Schicke & Führs & Fröhling - Symphonic Pictures

ELO - Eldorado

King Crimson - Starless and Bible Black

Pendragon - Passion

Comus - Out of the Coma   white/black splatter

I paid no more than $9 for any given title. A couple I only paid $2-$3 for.