The vehicle can be as cheap as an AEC who's DPS in late game is not important while it can still snare.
The vehicle suffers only DPS penalties (-50% accuracy +100 reload ) that have little impact in unit like AVRE or AEC(wanted for snare in late game) or even FF (high accuracy alpha strike with tulips) or Churchill (that can serve as meat shield)
That's why timing isn't an issue with Command Vehicle - if you want an early-mid game Command Vehicle then you *have* to either tech AEC or sacrifice your very first tank which comes a lot later than 2 CP. Command AEC is considerably more squishy than other command tanks and prevents you from diving after other light vehicles which is why you get it in the first place and is more likely to die early or survive in the late game.
Nobody would ever use a Command Firefly (lol 16 second reload) or AVRE now that it doubles petard mortar recharge. So now you are stuck with using Churchill (good luck getting that fast) or using your very first Cromwell or Centaur and have to support it with other AT since it can never 1v1 another tank ever again. If you want someone to sacrifice their first tank (it's never going to contribute much beyond it's aura) then that aura has to be worth it because you are knowingly conceding the armor advantage to your opponent by doing that.
The other option? Wait until the late game and downgrade an AEC that showhow survived or make a command tank with tank #2 or 3 and at that point why bother if the aura isn't good? Nevermind that Tommys and Sappers are getting nerfed in the DBP and you can't just spam 4-5 Tommys at start and win with brute force anymore.