Re: Why players don't go to net more often?
Llodra is not necessarily better at the net than most guys. He really has no choice but to rush forward; he's just better in doubles tennis.
I only see effective serve, volley & dropshots from someone like Janowicz because he's agile, taller & very fast.
If you force a very short or overweight slow guy to net, he'll need luck to win some tourneys. If they have foolish techniques from the baseline and they aren't very talented and flexible at net, they'll lose every major tourney.