I wish Sony would try bringing more F2P stuff to Vita. They seem to be pretty big on it on PS4 (Blacklight Retribution; Planetside 2; War Thunder) but there's a distinct lack of it on Vita.
Like Noctis posted a while back, just target some of the smaller-scale MMO's on PC that don't have high system requirements, and ask if they'd port across. F2P games make most of their money off a small amount of consumers, so I bet they'd do really well on Vita since the fanbase is small but loyal.
And they'd get a lot more exposure than being lost in the PC market.