Nice name. Many development possibilities. A city communications network, city guide, ISP...
Without knowing the traffic stats, I'd say mid to high $X,000. A reseller might not be willing to pay that much; and end-user might pay considerably more.
Do you own this name?? I know 2 companies called metronet:
1) The underground operator in London
2) A broadband provider.
And that's without any research. When did you get this name? You may struggle with TM issues if it is recent. If you got it before these companies existed they may well want it from you!