MomentumPrice direction over the last 12 months and whether demand is accelerating or cooling.
LiquidityHow fast it sells and how tight the spread is between dealer ask and dealer buy offer.
ScarcityDiscontinued status, production volume, and waitlist pressure at authorized dealers.
Value entryWhere today's price sits against its own history: buying a dip scores higher than buying a peak.
Condition safetyAge, parts risk, water resistance, and how easy it is to buy a bad example. Higher is safer.