not saying there's anything wrong with creative BBQing.. I've been known to utulize the ole Texas Crutch myself.. but as I understand it, the reason most use the butter bath is to get some of the buttery flavor in their chicken.. it doesn't crisp it up from what 've seen. I believe you would achieve the same result with oil unless you throw it in something hot enough to melt steel.. you'll end up with chicken that tastes like grease.
Just a guess...
..and with my stick burner.. I'd be afraid to heat it up as high as you'd need to with oil inside... one grease fire in the smoker was enough to tell me I don't want to super heat it with a pot of boiling oil inside it.
4000 sq inch Wood Burner named Brutus - KCSB member/judge# 32129