(Modification of something 7.[WD]Ragor said)
If the vehicle were marked as unsellable for the purchasing team after the purchaser's death, the super-early extra money exploit would be prevented (even through teamwork). The player could still park the vehicle, suicide, respawn and reclaim the vehicle, and then amass money starting from CDT wages instead of whatever was left after purchasing the asset - BUT, not being able to sell the vehicle back to "trade up" later, it would come closer to balancing out. Of course, such a change prevents scavenging discarded friendly Mechs (but not hostile) from the battlefield for profit - but maybe that makes sense. The purchaser would have gotten their wages back after dieing, meaning the "owner" of the asset would be whoever gives out the cbills/equipment - the quartermaster, or whatever. You can't sell the quartermaster's goods back to the quartermaster.