That's absolutely jaw-dropping. I assumed that was a made-up Internet stat, and was going to ask for a cite, but some quick web searching confirms it.
I'm a used car guy, typically buying vehicles 2-3 years old, and would never contemplate paying above $20k. Even a brand new sedan (e.g. Nissan Altima, Honda Accord) is around $23k MSRP. A crossover family vehicle (e.g. Nissan Rogue, Honda CR-V) is around $25k.
What on earth are people purchasing, that the AVERAGE price is a low-to-mid range Mercedes?