That's a claim from an amateur, any substantial volume (> 100 BTC) would move btc-e in line with gox prices immediately and you already are losing money because getting usd to btc-e is costly. So no, you can't endlessly increase your funds this way
Small opportunities of 100 BTC with single digit profits now and then, possible.
Exactly. Having done this for about two years now between Gox, CampBX, Bitfloor, CryptoXChange, ExchB (remember them) and Tradehill, a
consistent 5% return is impossible with any kind of volume. Especially when you consider the fees & time involved for getting money in and out of BTC-e (which is why I don't even bother trading there). A typical return for me after fees is about 1/10th of that (0.5%)