nah, see, its not the butter you gotta worry about burning, its the thc.
it works like this:
THC boils/burns at 198 degrees F.
butter is about 120
oil is about 500
If you use butter, and keep it from bubbling, you will gaurentee that THC isnt burning away.
if you use oil, and you keep it from bubbling, it could be like 400 degrees and burning off precious THC.