Dude... this is the deal. The Raptor holds value better than most vehicles (maybe just under Porsche), but if you sell or trade after the 1st year... there is going to be a significant drop of MSRP. The next year and the next will drop significantly less.
Now let’s talk about your BMW plan. I too have a plan for a BMW and the Raptor is a means to that end. However... the M3 is not a transition vehicle for a Raptor owner. If you pay $70k for a new or near new M3, you will loose half of that after 3 years ($30-35k!). Have you driven the M3/4? It’s a young mans vehicle (20-30 year olds), it’s cold and hard inside, harsh riding and unforgiving.
My plan is to transition to a 2018/2019 M5 in 3 years. The $70k Raptor will still be worth $55-60k and the $120k M5 will also be around $55-60k... a smooth transition and someone else eats that $60k M5 depreciation.