Alberts doesn't make "left tackles money". His contract is no where near Joe Thomas' or Jake Long's, let alone Walter Jones or Chris Samuels. Also, other teams move / keep guys like Alberts on the right side (ala Jordan Gross). Finally, this move was originally suggested by NFLN's Mike Mayock. Mayock figures this would be a solid move because the Chiefs would be set at the position for the next decade. Regardless, all of this might be moot because the Chiefs could still in a few other directions (trade down, pick Tyson Jackson, pick Curry etc).
Another team would pay Albert LT money to be their LT once he hits free agency. Thus, the Chiefs wouldn't be set for the next decade at tackle.
I'm glad you think it's a good move just because Mike Mayock said so.