People also forget that the difference is not as large as they claim at the end of the day. The 10k is not sunk cost, as you recover 50% or more in trading up or selling situation. The price differentials in the M3P and M3 AWD exemplify this quite clearly. The differential is about 5k. So ask yourself, 2-5 yrs down the line, what will your recovery be on MYP vs MY AWD? 5k differential? Very plausible.
If you got the Boost, that differential shrinks to 3k? For 3k I would rather drive the P version, with it's upgrades (whether you value them or not). To the people who say they would rather invest in the Tesla stock. First, I don't invest in stocks, I invest in real estate. Second, i don't have 60k laying around, or 50k, or 40k... In fact I live pretty frugally. It's the monthly payment.
No, I can't take the 10k, or real life 3k differential and invest it in the stock. First, I think the stock is dumb rich (I am not arguing the valuation per se, it's just I can't stomach the multiple), for ppl that did well in it, I applaud you and kudos to you. The fact that we are discussing this point shows that nobody is starving here. Second, my job is very strict with my personal investments. I can't have a kitty to play with in realistic sense. So basically I dont.
So to end this long winded (hopefully people realize I am just being humorous) rant, if you are on the fence, go for the P!!!