"Similar sizes" are not "the same size", obviously. I've never found any manufacturer that actually makes 10TB SSDs. Whether it is "unreasonable" or not is entirely irrelevant when they don't exist. The price is an obvious clue to anyone who knows anything about storage, as you mention.
But, choosing to use 10TB for the size in a scam seems like an odd choice. I have to imagine the scam would work equally well with a size that actually exists, but the current size should make it trivial for Amazon to filter out these listings, so it's odd that they aren't even tackling the low-hanging fruit.
Well, nothing exists until it does. There are oddball products out of China that are real.
I suspect 10TB is a very good choice, as it is a round figure that may have broad general appeal to people, and it also dissuades people who understand the importance of powers-of-two in storage sizes -- if you're scamming people, it's better to filter for those who don't know better, rather than for people who know better.
