Site development advice

[Diabro]

Hello,

I am new to this side of domains. I have purchased domains for personal use or possible project use in the future.

Now I have a domain that I would like to develop.

Unfortunately it would be for a Polish audience and I do not know Polish which is a twist.

I will of course hire a native developer. I have two that I have researched already.

But my question is how much would it be worth spending?

Would anyone be able to give me a general estimate on if they believe these sites are making money and how much they could or should be making:

http://www.e-londyn.pl/

http://www.londyn.webd.pl/

The above domains are for Londyn which is Polish for London and look fairly well developed :imho:.

I just would like an estimate from a pro to see if it is worth putting money into the development.

My site currently gets unsolicited offers but I am not really interested in selling a domain unless I can get a lot out of it because once I sell them I will have a hard time replacing them.

Thank you for any information you can give me.