People make bad investments all the time. You can't make generalizations. But the established extensions are where the action is. Not in the gadget TLDs.
No, people just don't 'invest' in new extensions. Most of the time, they are gambling, it's not the same thing.
But investing gambling is easy, anybody can do it. Selling domains on the other hand is hard.
It's pretty easy. If you can't sell this domain because nobody wants it, then it has no value.
If the domain is really good, why was it still available ? That must be because it's just another extension among hundreds, soon thousands of new extensions.
People don't like buy domains on the aftermarket unless the domain is really good, priced right, and there are no better alternatives. Of course, in the present case there are countless alternatives.
And again, it's much too early to focus on the secondary market when the primary has yet to take shape.