Hmm, I never thought of doing that. So far I think I own about 40 heads. I will probably get to around 350 at some point where I will own every quality head in toribash.
And now getting back to reality, I'll consider this a challange
Eh, not really, they are worth a bit more actually. But on my overpriced market, the Nightmare head is 250k, Ferrock's demon head is 150k and Lastduck's is 50k.
Sounds crazy right? But look at how many stuff I sold so far ;p