This makes no sense to me.

People don’t invent an amazing thing and then keep it secret to make a profit. they patent it and make a product or license it.

I am totally willing to believe they managed to keep something secret. Hell if it’s true it means they actually did a pretty shit job because everyone knows the word ‘Roswell’

But I don’t buy that after 50 years they haven’t made a single useful thing out of what they found. Where’s my flying saucer damn it? Where’s some new amazing power source that any craft getting here must have been using?