Frankly, I don't understand you or anyone else who wants domains for less than USD 6.00
Registrar is paying (in .com case) USD 6.00 to the registry and USD 0.25 to ICANN, making it's total costs USD 6.25. So I think that USD 6.60 is REALLY good price for end user. Anything less would be working for a loss leader with all consequences.