I've seen the capacitor issues in other devices (mostly power supplies)

You can save a few $.01 by using a lower-voltage rated capacitor, the only consequence is sometimes the item fails earlier- And if it takes longer then 6m or a year to fail, you (the manufacturer) can legally skate out of any warranty issues...and either leave the retailer or the customer holding the bag.
Shiznitty business if you ask me, but without taking everything apart and looking at the side of each can...)

-John

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2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)