Could they really be cash-ins, when there is little to no money being made? ;P
In seriousness though, this is what happens when a system has such a consistently small user base, with little growth month over month. Companies don't have incentive to bring their wares over, if they do, they'll be quick and effortless. EA is not going to invest heavy amounts of manpower, nor are they going to assign people (resources) away from anything more pressing - the Vita, as of now, is of no concern for them.
We can fume and fuss, not support their games, but that'll bring either consequence:
No more games.
Bad, worse games.
The vocal minority that would refuse to buy their Vita wares is small (userbase is small, amount of their available wares are small) - as is the overall Vita consequence/risk on EA.
The games aren't selling in big numbers (no game in Vita is anywhere), thereby (in their publisher mentality) EA is almost doing a favor by porting any game over (it won't sell a lot anywhere, cost of marketing, development and distribution) - they might not even make any profit, let alone break even.
My ranting isn't really cohesive - but maybe someone can get a sense of what I'm saying? We are here bitching, wanting better ports (which is deserved by fantastic hardware) - but games aren't selling and the ecosystem is small. No matter how loud, we aren't going to get any better than what we are getting for the time being, we don't justify the cost. This is the consequence of hardware selling at Dreamcast levels. I'm not trying to be negative or angry. Realistic and without delusion about the very real current state of my Vita.