I think it’s going to be worth a lot more now you are developing it. If it gets high traffic and becomes the ‘go to place’ for people wanting info visiting Wales then you have a winner and it could sell for a huge amount.
The domain itself I don’t think is too expensive though unfortunately. It is obviously is worth something, but I don’t think its life changing.
.com whilst gold standard in America, it doesn’t matter too much to companies and people in the UK, UK companies and even FTSE 100 companies are happy to go with .co.uk.
.org is not even thought about too much, so if you were to try and find a buyer for the domain itself (nothing on) I think it would be hard to find a buyer.
I remember a great domain (UK region) being offered on NamePros around 2 years ago, Midlands dot com, it was on here for a few weeks too, previous owner wanted around $5k-$7k for it, I was tempted, i wish i did now because i don't think the domain is limited to the midlands region, but I never bought it because I thought it would be hard to sell for the reasons I spoke about above (UK being too familiar and happy to go with .co.uk) but if I knew how to develop, I would have snapped it up instantly and made it the go to site for the Midlands region like Yorkshire dot com is for Yorkshire, so you are doing the right thing with your domain name.
Get traffic and make the domain the go to place for information about Wales (news/people thinking about visiting) and you have a winner.
Best of luck with it.