There's more to the game of basketball than PER. No matter how hard the mathematicians and statisticians try, you can't use a single number to express the entire worth of a player. PER is one of the better attempts, but it has it's flaws. It overrates some stats and underrates others.
Players with very limited minutes often have PERs much higher than players who contribute more, in absolute production, over significantly more minutes. So, a guy who plays a couple minutes of garbage time in a 20-point blowout against the other teams 3rd string scrubs may end up with a higher PER than a starter who averages 30 minutes a game, mostly against the other team's starting unit. This is more than just an issue of sample size, it's also an issue of the quality of the opposition.
During his three seasons in the league, Martell Webster has started 105 games. During his first five seasons in the league, Travis Outlaw started a total of 20 games. Last season was also the first time in five years in the league that Travis played significant minutes in the 4th quarter of close games. Prior to that, almost all of his contributions came against other teams' second units, while the majority of Martell's contributions have come against other teams' starters. Yes, the points all count the same no matter who's guarding you, but my point is it is generally harder to score against the other teams best players than against their second string. It's also generally hard to guard the other team's best players than their back-ups. Night in and night out, Martell is asked to go head to head against some of the best players in the league. It's a difficult assignment, and he's been asked to do it since he was 19 years old.
I'm not a Travis hater, and I'm not trying to minimize his contributions, but I do think Martell is a better all-around player than Travis. I think he has a more well rounded game with a more diverse skill set. They are both valuable and contribute in different ways, but in this league starters generally get paid more than bench players (not named Manu). So, I think $5m/year for Martell and $4m/year for Travis is completely fair and justifiable given the roles the two play.
BNM