That would be a very risky con. DPR had friendlychemist's real name and could have hired a different hitman.

Perhaps the name was fake?

That can't happen on the internet; it's against the law.

Or that he got the $300K clean for the $150k price and thus there's no trace?

If Person A has known motive to kill Person B, in a "non-clean" hit Person A will immediately come under suspicion. If the hit is "clean", anything could have happened and it's a lot harder to establish it as a murder and therefore Person A has a much lower risk of being brought into the case.

Wouldn't "non-clean" be cheaper then, if fewer precautions are being taken?

I took it to mean fast and relatively painless versus protracted suffering, i.e. "non-clean", messy.

I'm just assuming it was sloppy grammar, similar to "We have two sizes, large and small, they go for $5 or $10."

Without the 'respectively', it's ambiguous whether the clean or non-clean were the cheaper of the two alternatives.

I suspect doing a "clean" hit requires more skill and experience.

i was thinking the exact same thing ...