To prop the price up would require buying not selling BTC, so how much BTC you currently hold doesn't matter so much as how much USD you can pump in to keep the

To prop the price up would require buying not selling BTC, so how much BTC you currently hold doesn't matter so much as how much USD you can pump in to keep the price up. As for how well that would go, well the UK government tried something similar once: http://en.wikipedia.org/wiki/Black_Wednesday http://en.wikipedia.org/wiki/Black_Wednesday