Sounds like nonsense to me: if you buy 1 BTC from me, then at the same time I've sold 1 BTC? That makes it by definition as equally hard (or easy) to buy as to sell?
Try buying an iPhone 3g right now on Craigslist. I bet it takes you all of two minutes.
Then try selling it. I bet it takes quite a bit more time.
Asymmetry.
Currently (and for the last years), the price of BTC has been rising implying that's actually easier to sell BTC than to buy? Moreover there are exchanges that are entirely symmetric (when opening accounts you do not need to qualify as a buyer or seller).
Asymmetry is a nice word but I don't see what's asymmetric here?
Also there is some basic lapse in logic here. Just because a WoW nerd can trace the currency on a technical level, does not mean it is "easy."