Yes, you will have to recure it, and this service of curing the LR definantly adds to the cost of the LR.
The whole reason to cure LR is so that all of the dead/decaying matter, can get cleaned off, or rot away before you put it in your tank, so that your tank will not have an ammonia spike.
As you cure LR some organisms live through the process.
Now if you were to buy the cured LR off this site, then that LR is gonna be without water for about 2-3 days, and in those 2-3 days some of the organisms that survived the initial curing process are going to die, so you will have to re-cure teh rock anyways.
Why pay for a service that you are jsut going to have to do yourself?
Now if this tank hasn't cycled yet, then do not cure it because you want the dead organisms to cause a ammonia spike, there for starting your cycle.
HTH