I encountered this while reading Astérix gladiateur, and I can't make heads or tails of this sentence. The bard Assurancetourix has been captured and brought to Caesar as a gift. In Caesar's court he is standing in chains and thinking to himself:
Tu peux toujours courir pour que je chante pour toi ! Et tu ne sais pas ce que tu perds!
This seems to mean:
You can always run so that I sing for you! And you won't know what you're missing!
Which of course makes no sense. Am I misunderstanding the role of courir here?