I think you mean Hive Power.
Well HP offers more than just a ROI based upon the inflation. There is also what you can do with it in terms of voting power which leads to curation rewards as well as governance.
Plus, if the peg works, HBD would then be at a constant price. Most who are hodling HIVE are doing so because they believe it will be higher in the future; not something one would conclude with HBD if the peg is in effect.
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