I received an email from K5DNL a few days ago. He informed me that he has been transmitting WSPR on 476.700 for the past 5 years and asked that I refrain ("move up or down") from that frequency if I intend to use WSPR since he has been on that freq for so long.
He had not been transmitting when I started but when he wants to operate WSPR, he wants to do it on that freq - and will, regardless of whether anyone is there at the time.
Ken K5DNL, are you reading this? Public comments are welcome...