There's a common attack that boosts the wireless signal of proximity fob to trick the vehicle into unlocking & starting. Fob wireless systems should ideally redesigned such that the round trip time is precisely measured of only valid encrypted challenge responses that only the fob can answer.

Spending a bunch of money on a luxury vehicle is usually idiotic and most people who do so usually can't afford it in proportion to their income sheet and balance sheet. Plus, it advertises the owner and the vehicle as targets for all sorts of criminal intrigue.