The Dota 2 team have detailed of process of building the Aegis of Champions - the massive trophy and functioning shield* given out at the end of this year's International tournament - in conjunction with master propbuilders WETA.
It's notable (ish) that Butterfly is the cheapest real-life weapon, as it costs a hefty 6000 gold in the game itself. Vanguard is only 2225, for heaven's sake - and who doesn't already have a stout shield and a ring of health lying around? Demon Edge will cost you 2400 gold all in one go, but really it's just a stepping stone on the way to a Daedalus.
Basically, I'm saying that if you're in the market for a massive urethane sword, then Butterfly is the best value proposition. Also, that 35% evasion chance could come in handy when crossing the road.**
* I am perfectly happy to take Gabe Newell at his word in this regard.
** Please under no circumstances attempt this.
