2 links have been added on this idea.
  1. Careful what you wish for, imagine being the victim of future blood mugging crime – “The global market – worth $23.6bn in 2016 – is predicted to almost double to $44.3bn by 2023.”

  2. You do get paid in the UK. “You will be paid up to £100 for donating 600 mls of blood or a proportional amount if less blood has been donated, i.e. £50 for 300 mls.”