The high cost of the Vita's memory cards prevents me from buying a product with fantastic software, which can only get better with the PS4's immense popularity. I'm really big with downloading titles upon release and having that added space on the memory card to use with the PSN Plus service that allows monthly free game downloads.
I don't understand why Sony won't use the standard microsd card.
I think you answered your own question.
To add salt to the wounds, the vita cards are actually slower than your ordinary microSd or SD card.