Androird phones which are even more expensive than a Vita. :3They might not have a vita, they might just have an android phone. $1.50 is not a lot of money, sure, but relative to the price, it's a significant hike. SCB is 75% more expensive than on iOS for the same exact game. It's definitely a valid complaint, you might not care, but others might.
Like I said though, this might be the publisher hiking the price due to the much smaller install base as compared to the iOS one.
Also, as I said, when we are talking about 1-5$, relativity means jack shit. It'd be different if someone was trying to sell a 1$ game for 15$ on Vita or something, but it's JUST a 1,50$ difference. I'm a poor student and I have no problem with that.