I like doing high rep deads every so often when I get a bug up my butt. But I will do only high rep deads, no other dead work once per week and keep it going until I'm completely worn out and/or have set a new PR. It doesn't help my one rep max but does give me that 'satisfied' feeling. They are also very hard on your recovery and why I am a big fan of deads every 14 days when they become nearly intolerable, which for me is when they start impacting my other lifts.