These aren't consumer products. They're specialized business products aimed at market researchers. In that context, €5,900 doesn't seem expensive at all to me, and I'd expect the Tobii glasses to be more.

The tobii monitor mounted eye tracker that delivers almost all the value required for SWE is only a few hundred dollars.

What does SWE mean in this context?

Which proves my point exactly. The Tobii Eye Tracker V is a consumer-oriented product marketed to gamers. The market-research-oriented use cases that one would need for a "walking around pair of eye-tracking glasses" are totally different, and they're priced accordingly.

Except you can't use it for research purposes at all, nor anything other than gaming...

We're building one that's only 500 euros - kexxu.com

It uses a convolutional neural network to detect the pupil location, which is a lot cheaper in addition to running real time (for controlling IoT devices around the house). The website shows the 3d printed prototype, injection molded mass production coming in about two months, probl also on kickstarter. We'll open source our libraries in Python, JavaScript, C++, Arduino, Dart (Flutter) to connect to it with MQTT to all DIY projects that can benefit from eye control. In addition to gaze location, the scene camera can detect ARUCO markers and QR-codes. The battery lasts about 10hrs.

Email me at [email protected] if you want early access.

way way more :) The earlier versions cost around at least double to triple the amount.