I've always thought the perfect time is when they express a felt need. I had a guy and his kids over at my house last night. He had been trying to flip houses to protect his savings and had just recently got burnt out. I brought up Bitcoin as a much more stress free way of saving and it was the most receptive he's ever been. All this to say, I don't think the number go up or down timing is nearly as important as people's personal needs timing.