While I can't be entirely sympathetic, I would like to point out that there's some mixed information on the Vita online which could result in similar issues.
For example, I read a review on CVG which clearly states that:
Plus there are hidden costs: if six weeks spent living with the PS Vita have taught us anything, it's that anyone who buys one will also have to invest in a (proprietary) memory card, because the 16Gb one provided as standard fills up very swiftly. Prospective PS Vita owners will have to be both keen gamers and pretty flush financially.
Despite the fact that the Vita has no included memory card, and even if it did, it wouldn't be the 16Gb model.
There's also some confusion over the whole memory card thing as some places say you need one for pretty much everything, and others say that you'll only need one for games which don't have built in save space, such as Uncharted.
The data limits on the 3G model do make it kind of pointless, especially if your phone has unlimited data and the ability to work as a Wifi hotspot, though calling it "unlimited" (or "all you can eat" in my case) is kind of a lie (3 only gives me 1Gb per month on their unlimited plan).
I've been looking into the Vita myself recently as I have a load of old 360 games (including Tales of Vesperia, which is rare over here) and a Wii I rarely use, so they could be sold to pay a fair amount of the cost.
My phone (HTC Sensation) has enough grunt to power the games available for it, but the battery is fairly hopeless for gaming.