Normally if someone has 250,000 of anything it would not be to their advantage to crash the market before a sell-off. If anything they should prop-up the currency value with fake press releases as they sell in order to cash out high and buy back in as low as possible, then write a story about the sell-off to cause a panic.

That said, I suppose it's also possible that a group would want to destroy the currency in its current form too, for giggles?