If you really want to make money  with Poser or Studio, I suggest doing props and or scenery. Doesn't matter which program you make that for.

This is what I would do. There are an infinite number of things you can make. Lots of untapped niches big enough for a full time income. If you release props in obj format as well, they can be used by any software, as you say. I've spent a lot on props and scenery, and there are still things I'd like to see made. Plus, if the models are high quality, they will be good to sell for years, regardless of which figures are popular at the time. So, yes. Totally agree. 

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.