
This surprisingly high cost annoyed me as well when considering the purchase

Tough I acquired mine (edit!)(T1) for 'only' $300 some 4 years ago. As you say, it's really a very simple thing - there's no 'secret kryptonite-platinum alloy decoder ring'


so the manufacturing process shouldn't be that complicated. I guess it's about the design cost versus the relative limited market, as has already been indicated.
When I purchased mine I was in doubt if it would give value for money. Now, 4 years later, I have to say I have never regretted that purchase at all. I consider the Signoscope a must-have, as it has helped me to identify a lot of watermarks that I simply didn't find before. So after I got it, I have revisited a lot of stamps that I earlier assumed to have the 'least valuable' watermark - and I have identified many of them to actually be the more desireable. Especially for yellow-orange colored stamps the device is fantastic, as those are often simply close to impossible with fluid. Same for certain colored-paper British definitives with Edward&George. In terms of 'value-increase' to my collection, the investment has in that respect paid-off repeatedly. (And no - I do not hold any shares in 'SAFE' ...!) That's my 2d anyway
btw - I tested and compared the T1 with T2 - I would certainly pay the extra $ for (edit!) T1. Sticking to blcjr's terminology

it's like comparing turbo/non-turbo Porches.
Edit as reply on addendum: I have the T1. The reason that's better is that you can apply mcuh more pressure, in an a quicker fashion - giving more clear and much quicker results. It's all about getting the paper clinged to a surface, so the pressure is the key. In terms of being helpful, it must also be easy/quick to use - T1 is much better in both aspects