Don't try to fit your domain name into some 'proprietary pricing model'.
Every domain name is applicable to a different target market.
High asking prices - Names that have ridiculous or greedy asking prices rarely sell. Don't waste your time listing names like these. They rarely sell. Bearing these things in mind, it seems logical to decide what you'd really like to get out of the names and price the names appropriately. Include a little room to negotiate, but be realistic in your expectations.