ihatefatkatz on 09 June 2015
Probably had to do with fanbases. By that I mean many of the low-mid tier franchise had fostered a following on the PSP and that audience would naturally transfer to the vita. So it made sense for developers to make these games for the PS Vita.
All the mainstream stuff was more suitable for the better selling 3DS.
It's similar to why Sonic, skylander, disney infinity and rayman games keeps coming to Nintendo consoles.
That's my explanation.
