+1Hi Casey, it doesn't matter, at all.
Question: "Is it ok to store brushes upright?"
Answer: NO!!!!!!!!!!!!!!!!!!!!!! Unless you live 'Down Under' then it is perfectly acceptable
Of course whatever you do, you need at least a full week of brushes to allow them to dry properly.
I was actually going to contact the creator of the Dyson fan and see if he could invent a brush dryer that allows the brush to hover in the drying chamber. While it is hovering the brush will inherently change angles of drying, after all that is really the key, keeping the brush at a different angle for no more than 17.3 minutes while drying...
Thanks I was starting to think I was doing it wrong.