Thanks for the replies,
I'm not a standard Bitcoiner, as I don't want to get into trading. I see Bitcon as "virtual gold", and as such I want to build up a small holding as part of my wealth protection strategy. The other assets that I've been collecting are domain names. I see them as virtual real estate. They sit together with Bitcoin fairly well. I do sell a few names, and I'm able to leave the proceeds in my registrar account, and I can withdraw thin in Bitcoin when I feel like it. My interest in price movements is to help me to decide when to claim these payments. I have to take a bit of as view on trends as withdrawal isn't immediate, and it could take up to a day for the funds to be released. I suspect they may batch transactions to reduce fees, and this is fine for me, as they don't make any charge for Bitcoin withdrawals.
Making a correct decision as to the time of withdrawal can double the amount of Bitcoin I receive in these times of extreme volatility. I'm also considering running nodes to collect the bit of Bitcoin Cash and Bitcoin Gold that I have been awarded as a result of the parallel blockchain creations. I may start to accept those in payment for domain names as well.