Since it seems you want to be a bit mysterious about the reasons for this decision, I won't press you, but will just say that I wish you the best. I haven't been posting here regularly for the last few months but it wouldn't have occurred to me to do a formal 'sign off' since I never thought I wouldn't be back at some point. (and here I am) Sure you're never coming back? Well, if not, good luck, and safe driving!