Don't really get the "debate" on 180 v 181. 180 is the first appearance (I mean, it is) but 181 is the first, cover, first story, first character development, etc., etc. Makes perfect sense to me that 181 is worth more - and I say this as a 180 owner who wishes it were flipped.
Thanks for responses - seems first appearances do account for the price discrepancy though the speculation that there are maybe less of 129 and 130 in circulation does not seem out of the question as at least contributing to it.