TeleTrade prices on Canadian

Had my first look at TT in many years, and was looking at recent prices realized for Canadian coins. They seem very low compared to Ebay prices, much less "book" value. Is that attributable to the ANACS and NGC grading? Other factors?
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DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don