Yeah confirmed it for myself.
The Balls and Grove vehicles are worth a lot. The purple Peyote is like 12k and one of the green Grove Street cars I got for almost 10k. Both worth more than the Baller SUVs that sell for 9k. When you see one, grab it and store it for later or sell it. Quick cash.
Also got my first super car, 9F Cabrio. Feels good because I never glitched or cheated to get it.