No, they weren’t, and among subcaps, most of the cases where a ship did have an outsized price jump, it was simply due to tiericide normalization (ca. 2012-2013) and not whatever reason you’re imagining.
Yes, and ice mining was famously atrocious income because of that.
The entire reason they did away with permanent ice fields was to make it more worthwhile for a normal miner to mine it.
Here’s a 2013 thread prior to the change discussing this incredible highsec income you’re hallucinating: Updated ISk per hour Ice mining? - Science & Industry - EVE Online Forums
Some highlights:
A few mill per hours. You can do it AFK in the gallente empire space. System such as Deninard, Tolle and Angymonn are good choice. Pretty quiet.
Scratching my head about even wanting to know this. Mining Ice for direct sale is indeed the lowest ISK/hr activity ingame.
ICE mining profits were up for a while after the ship changes. But due to how easy it now is to semi AFK ice mine ICE has dropped way down in value. Fuel blocks have dropped from 16-20k isk/unit to 12-14k isk/unit. But are just as profitable as they were due to lower ice costs.
I am down to each ship making around 10 mil/hr mining ice, while I can do 25 mil/hour mining ore. And that was a month ago, It is even lower now.
These are from January of 2013; Ice moved into anomalies in the summer patch that year.
Here’s the dev blog about that change, which also has some interesting statements: https://www.eveonline.com/news/view/resource-shakeup-blog#ICE
At current levels of ice product usage, all of the ice needed for the entire game could be provided by only four ice belts (one of each ice type).
Ice mining was bad even by the standards of high sec mining at the time. Who’s to say why you remember it being otherwise, but you are definitely misremembering.