In terms of 93/94, in my experience, the Euro sellers (both on a large-scale retail and small, Facebook trader level) are just as bad as the North American ones.
While I sympathize that it feels bad to miss out and have to pay new prices on these cards, the reality is that there is there are very few (relative to modern Magic printings) available. I'm sure you've all see the numbers, but for posterity's sake:
https://i.imgur.com/hXXa6HY.png
(Full early MTG era print-run info:
https://www.usc.edu/dept/Deckmasters...g/printrun.txt )
Doing some "guestimates", it's probably fair to say that 20-30% the original print runs of ABU are gone forever whether destroyed or damaged to the point of being worthless, are sitting in a forgotten shoebox, or, in the vast minority, they are encapsulated and in someone's permanent collection (effectively gone forever). So, realistically, between ABU, there are probably 15000 copies of any given rare that are still around and very few are available for sale. So, simple supply and demand; low supply and a recent surge in demand. Also, there is specific demand for NM cards from that era, which are even fewer and farther between. I would wager that the ratio between played/unplayed cards of that era is probably close to 10:1.
Most of the people who were not attached have already moved cards, with some going into the hands of resellers, but the majority are going into the hands of players/collectors. The only way to shake new stock out onto the market is to incentivize people to sell their personal playstock by driving up the price. For example, Unlimited Jayemdae Tomes: In early January, a few buyers decided they really wanted Unlimited Jayemdae Tomes. A few auctions on eBay ended at $75+ for single Jayemdae Tomes, up from $3-5 the month previous. But rather than being an outlier, a more people continued to win auctions at this price. I personally downgraded to Revised at this price point, as there was enough monetary incentive to sell cards from my personal, "unsellable" collection. Another example of this is Arabian Nights Serendib Efreet, up from $30 to a consistent selling price of $125+. Once again, the higher prices are driven by NM cards, but this upward traction effects all conditions.
In the specific case of Winter Orb, don't despair; the only place I see $100 Winter Orbs is on Dan Bocks eBay, and if you check sold listings (the only pricing metric that matters) they are selling in the $20-25 USD range a piece (based on multiple auctions between Feb 1 - 9). If you only refer to active listings, I can make any card $1,000,000.
My advice to those feeling suckered is to simply not worry about the Swedish rules set. Go ahead, play with Revised, who gives a shit? If you are worried about the monetary cost, play with what you can afford; few people are going to be sticklers, and if they are, fuck them, there not worth playing with. Sure, maybe the people in Gothenburg have reason to complain, but anyone outside of Sweden should really not care. That said, if you want to follow the Swedish rule set, by all means do, but recognize that this is YOUR choice, and the fact of the matter is that multiple people in your position are the exact people that are driving up prices. Retailers would happily sell $10 UNL Winter Orbs if they sold 1 a month, but now hundreds if not thousands of people around the world are looking to actively scoop these up. Complaining about prices on cards that are rare and considered pimp is silly whether it’s Magic 94, Summer, or Jap/Rus/Kor foils. They are expensive because there aren’t a lot of them out there and a lot of people want them, end of story.