Now that I think of it, isn't this merely a logistical issue?
How much you can cellar will be determined by three factors:
Budget
Space
Frequency of your smoking
So, let's say a 50g tin lasts you roughly 25 smokes (i.e. 2g per smoke). Now, let's say you smoke an average of four times a day. At that rate, a 50g tin would last 6 or 7 days. From there, it's just a matter of how much you are willing to spend, and how much physical space you can devote to storage.
That's really it. There may be other factors, but those are the three every smoker who wishes to cellar must solve.