I will always buy bulk when available. I would have 50x's as many GLP blends if I wasn't constricted to only buying tins. For now, I just keep a few tins of each of his blends on hand, while I buy other things by three to five pound intervals. And, my experience with trying to re-jar the bulk GLP tins of his blends was not so good. It may not have been an inherent problem of his large tins or the tobacco, but it was enough to sway me away from doing it again.
And, having a pound sized tin that I am waiting years to pop is just stupid. Once I do pop the tin of an aged blend, I've only got a window of a few weeks to enjoy it, before it's just humdrum crap. And, this I just know from experience with aged tobaccos.
I mean, I do keep many, many tins of things I really like that there is no bulk option for, but I'll never have as many tins as I do jars.
YMMV