[nephanth]

In terms of energy, you'll always need more to recapture than burning that fuel will give you (cuz entropy)

So if money = energy (which is a wrong assumption), buying that barrel would always be a loss

[adrianN]

If you capture the carbon for example as carbon dioxide instead of methane "cuz entropy" need not apply.

[tinco]

Unless that barrel is a higher value to you than the energy required to create the barrel would otherwise be.