Difference is Wein (and I'm guessing Wrightson) get royalties for Swamp Thing and all their other creations (which also were likely WFH). 
I wonder if Bisette knew that when he first took the Swamp Thing job?


Yes, and he's also the guy who got a $45,000 check when the Constantine movie was made.
That is very good news to me, and I'm happy that you mentioned that. Thank you.