The CPI was already built into the discussion (the original discussion was inflation--CPI adjusted--prices, and this branch was about a comment that indicated that wages had not kept price with inflation) and the housing price thing just indicates that buying a house has gotten more expensive even adjusting for inflation, which is true but way afield of the discussion of game prices.
If salary of the average Joe was doubled as well your logic would be ok. Bit it did not.
P.S. It appears that I am wrong about median salary growth so my point should be discarded