A domain is only as valuable as what people are prepered to pay out for it not what the owner thinks it is worth,using these valuation sites to get some indication has to be seen as purely for fun.The only thing really to do is put in on Flippa with a reserve and let it find its own price.
You can make an fan-site of Barcelona on that domain. Maybe include an forum for fans and hopefully you can get some users. But right now i would say you can get $50-100 for it.
I'm thinking of approaching some end users, may be some admins of FCB fan sites or even the official FCB club telling them I have a domain that they might be interested in. How much money would you ask for if you owned this domain?