They did, some months -maybe a year or so ago- they had an open job position to work in emulators.
But once it's done, to put more games into an emultor doesn't need extra coders (only need them and designers for trophies).
Once the emulator is done, the only thing they need is to publishers to sign games for it, in case they have all the licenses to do it (in addition to a programmer and a designer to put trophies and write the metadata of the storre, like the small description of the game, also need someone from legal department for the licenses, plus also some artist to make the images like icon/cover art/bg image/screenshots needed for the store).
The thing is seeing that the Sony PS1/PS2/PSP classic games had so poor sales in the insomniac leak, I assume publishers consider that sales won't be enough to cover these low costs.
