If you really want to determine the trade value of these guys, divide their RC numbers by their salaries.
Mediocre numbers + low salary = trade value.
That is why Larue has trade value, not because he is a great hitter or receiver. Laure is producing at about the same rate or outproducing guys like Jason Kendall, Charles Johnson, Sandy Alomar and Javy Lopez, while making only 3%-5% as much money as those guys.
There are a number of teams who would LOVE to have Jason Larue because he is better AND cheaper than any of their other available options.