It was the sharing of the benefits and the altruism involved which convinced me it was more than a simple vote-buying scheme when it first started. Since then, I've come to understand its also a show of one's long-term commitment to Hive. Because of the given reasons, the APR and length of time to recoup the investment pale into insignificance.
Glad to see HSBI still going after all these years and good to say it is still being talked about.
Best wishes and have a great day :-)