Well... because of the competiton between a few 
bidders on YJ, good Heero cels have been going 
for incredibly high prices. I tried to win 
several wtih no luck. The Duo cels that were so 
expensive were very nice and were from Endless 
Waltz, which automatically makes them coveted due 
to their rarity. But I think that a couple people 
with deep pockets are mostly responsible for the 
extreme prices on YJ.