a tier 7 sells for tt + 7K
a tier 8 tt + 8K
a tier 9 tt +9K
a tier 10 tt+10K Ped
I would like to know where you got your prices from? Reason being is that I have an Arso III Ten chip myself, and what it shows in market history (granted does not show p2p trades) is the following (happy to provide screen shots if you don't believe me):
Tier 5 - Monthly +7495, Yearly +6927.42, Decade +7529.51
Tier 6 - Monthly N/A, Yearly +7676.03, Decade +8670.51
Tier 7 - Monthly N/A, Yearly +10666.05, Decade +10414.76
Tier 8 - Monthly N/A, Yearly N/A, Decade N/A
Tier 9 - Monthly N/A, Yearly N/A, Decade N/A
Tier 10 - Monthly N/A, Yearly N/A, Decade N/A
So as you can see, your numbers are way off, also there has not been any sold on AH for tier 8/9/10....most likely because if they have been traded its been p2p to avoid the high auction house fees that would be incurred.