Holi Fest - does it even make sense to buy any BPs other than Zenvo?

Starring up Gallardo and Supra barely give you any return. To increase their stars, you'll spend far more token on their BPs compared to what you'll get in return.
Authentica and Pagani are not even in question; even their returns on star up is bare minimum, and not possible to max them out unless you have a massive stock of tokens.

Instead, this'll leave you with less HF tokens for Zenvo. Does it make sense to just complete the 1 star level for every stage, and keep on buying Zenvo BPs as much as possible?

Asking as an f2p player.