The plethora of variations (based on the splatter patterns on the borders and the INC/INC. differences) were very recently added. This did not allow a lot of time for people in input any prices for those variations. Generally speaking, there is no differnce in the prices on the INC vs. INC. variants. (Hence the reason all other outlets do not distinguish them.) The Factory Set splatter pattern cards could command a small increase in value simply because one would have to break a factory set as a means of obtaining them. That said, I didn't bust any factory sets, yet in my extras of the team I collect, I had 2 or 3 of the factory set versions. So any additional value to those would be minimal, and again, most outlets (if any) recognize those differences.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).