let's say the finder of puzzle 120 will reveal the private key. In what way does it help you proceeding with finding #66 or #130 or ... ?
I strongly doubt that this will somehow help to solve 130 or 66, just as the keys 63, 115 and below previously did not help solve 120 and 64. This is just something like scientific interest. I previously spent a lot of time and resources trying to solve puzzle 120 and I'm still curious about its key.