It may not be possible to "pre-buy" credits. They may be able to reserve them though. Ford may pay $1,000 to reserve each credit with the understanding that they'd then pay $2,000 when available. However, if all of a sudden, the Federal government said "Elio Motors will qualify for one credit per vehicle they produce." (I know... government doing something fast...), an investor might think "Hmm... $6,800 car subsidized by credits worth $2,250 for each vehicle (actually, it's $2,500 per credit but Elio has to keep 10% of the credits as each manufacturer is required to pay 1 credit per 10 vehicles produced) plus the $1,000 net profit in each vehicle would be $3,250 profit on each $6,800 of sales plus 10% on all options sold." 47% profit is not bad at all in the auto manufacturing world.
$3,250 x 40,000 = $130,000,000 profit not including options...........hmmmmm
looks better than CDS's to me.