I think it would be good to see a “location” as many people want to sell/swap there boats they no longer want or to have a bit of cash for something else. You need to know a location if you are interested, as it could be local or in another country. Big boats can cost a lot for P&P and can be damaged on route, so pick up may only be possible, what is the point in replying to an ad, if you know that its to far to travel.
You don't have to put your number or street name, just a local town to you would do, and if you are in the UK, Europe, US. Could that do any real harm?? Sorry that's my ten pence worth. Sonic.