I ran the numbers on the pricing and rewards; you'd easily profit by renting his SP and then self-voting.

But I'm not sure why you're singling Hive account@blocktrades out. Hive account@minnowbooster has been leasing SP indiscriminately for months.

EDIT: When I ran these numbers, I was using outdated stats on the reward pool. Today the self-voting ROI appears to be slightly negative. Analysis: https://steemit.com/blocktrades/@biophil/can-the-blocktrades-sp-delegation-service-be-exploited-for-profit