The high end of the scale is about $1,600 difference between a loaded Lariat with just about every option and a loaded Platinum. I didn't look it up but I'd expect to get about 50% of the difference back between the two. You lose depreciation so you will not get back the full amount but frankly I don't care about the minimal $800 or so difference from selling because I bought it due to it being more comfortable, not because it is a "Platinum". That in itself is well worth it to me after long camping trips and long plowing days.
As silly as it sounds to some.. there is nothing like getting into a cold truck and grabbing the steering wheel and having it be ohhhh so warm.