The cost of wheels and tires.
I bought a like new set of 4 BFG on rallye wheel with center caps for around $300 at carlisle. Of course that was over 10 years ago :)
I love the look of the BFG but yeah they are stupid expensive for what they are. Im also running cooper cobra's on my dart sport 340 that I daily drive. Much cheaper and they are a really good tire.