Coming in very late on this one ...
Old brood comb is attractive to bees, not because it's brood comb per se, but rather because it's old, well-used beeswax - i.e. it stinks of propolis and 'bee' in general. So - slumgum will work just as well as an old brood comb, and most people will give you a bucketful gratis - so no need to buy it.
Wax moth will still lay on this stuff, but it's a lot more difficult for their larvae to live in it, not having the same 'passageways' that comb has. But anyway - slumgum is at best considered 100% disposable. Makes for good chicken feed.
LJ