TrueBlue's revenue based system allows their points to be redeemed close to 1.5 cents per point, so if you value Membership Rewards at close to 2 cents per point, you lose value on this transfer. (uponarriving.com)
The reason is that Southwest has a revenue based system whereby the number of miles they charge for an award flight is directly related to how much the flight would cost in cash. (moneyboss.com)
That's one of the perks of a revenue based system. (freakinflyers.com)