I guess that's one difference for me, I don't jar my stuff (don't have the space), everything just stays in their original tins. I also generally buy the smallest size tin available for a blend though too (so many in there I haven't yet tried, so I don't know if I will like them and thus, don't want to deal with selling/trading off the ones I don't want once finally opened).
But another part of not keeping too many open at once for me is that, well I like to sit with a blend for a while to get a feel for it.
Though, if I smoke more than once in a day, if I have the time, the subsequent smokes will all be different. If I already had one blend that day, I don't want it again that same day and want something else. I suppose if I regularly could smoke multiple bowls in a day, I'd make it through tins faster and could keep more open because they'd be gone faster.