Not even. I don't use scribd.
You can run SW with mini-d6 and wookiepedia entirely for free, if you so choose. Then you have the WEG systems, in which I don't believe I ever invested more than 50$ in total, and that's hedging it on the high end (available for six! dollars on amazon atm...). Dito on Mongoose's Traveller. I see no reason to use a highly specific ruleset when I can get the same experience from a more generally applicable one for less money.
And I don't think anyone would say you have to like or play FFG's SW.
But your preferences don't mean that FFG is ripping people off.