Arbitrage within the same exchange

[Kloug]

I was doing some BTC arbitrage on Bitstamp, where the EUR/USD prices were pretty different. Very safe thing to do in moments like these, but I noticed an even safer thing to do:

if you take a look at the EUR/USD trading pair on Bitstamp, you'll see a big spike up to 1.4. That means some lucky ones sold their EUR for above 1.4 USD... you can't beat that.

Who puts a market buy on a EUR/USD pair, though...