If you think you can do well at Intrade, I'll loan you the money if you can put up your karma as collateral.
That sounds flagrantly inappropriate. If you are confident that CronoDAS trying his hand at Intrade would be a good risk, why don't you just loan him the money and ask for interest or some percentage of what he makes? If you aren't confident that he'd do well enough to pay you back, isn't this just outright karma purchase?
Just a hedge against any akrasia that might pop up.
Here's our place to discuss Less Wrong topics that have not appeared in recent posts. Have fun building smaller brains inside of your brains (or not, as you please).