For the record ...
I am a licensee of both Filter Forge and Genetica. I agree with you that Genetica is a great product, but primarily because it suits my needs much better than Filter Forge. I stopped upgrading Filter Forge back at version 3 and it is safe to say that Filter Forge users pay a lot more than Genetica users if they stay in the upgrade path.
The Filter Forge filter library you point out has two primary drawbacks. 1) If you don't have the latest version of Filter Forge, most of the filters won't work. 2) Easily four out of five filters has flaws and would be considered useless by most users.
In addition, Filter Forge is incredibly slow at rendering images and previewing changes. The publisher has openly admitted that they made a bad programming choice early on and the lack of speed will never be fixed. It isn't unusual for a render to take more than 60 minutes at a size of 3600 x 3600 pixels.
Filter Forge is based around manipulating Perlin noise and is poor at working with photos. Genetica is superb at working with photos. That feature alone has earned me back the price of Genetica a hundred fold and my photo tiles sell well on a number of stock sites. Check them out for yourself: