I'd say neither, or neutral. In case of endusers, it is not always possible to determine psychological or mental state of any particular inquirer, as well their ultimate desires. Some may think that there should be negotiations like in middle-eastern small offline store (where the original asking price on anything is 100x higher exactly for negotitation purposes), others may simply inquire as a curiosity without any interntion to purchase @ any price, etc, etc, etc.
So imho what should work for endusers is pre-written neutral templates.
Another story would be inquires from younger domainers (it is not a rocket science to see the difference or even find name/nickname/branding in most cases) which are unfortunately epidemic and almost always nonsense ("I can offer you $100 for <..>"). I am still trying to figure out a better way to deal with this sort of inquiries - ignore them, or increase bin price especially if it is shown on the marketplace or landing page, or to respond with enduser templates (waste of time anyway).... ?