1. In settings >>> General on Skype theres an option to "Share my location with Bing" not sure that's the same as sharing IP address (or who the fuck even uses Bing lol) but you might want to turn that off.
2. If you're super worried about your IP address being exposed you can get a VPN (Virtual Private Network) for around $3-$5 per month, and it will totally hide your IP and Internet usage. There are a ton, this is the one I've heard great things about:
https://www.privateinternetaccess.com/
3. Thank you for this thread. I've also received a TON of Skype requests and have also found myself hitting the breaks on them. It's confusing to know what to charge, what is expected, and just generally how to keep yourself/info safe. I also don't want Skypes/PVT to interrupt my chatroom flow. I'm thinking about adding them to m MFC share and specifying that people have to schedule them. Regardless, it's nice to know I'm not alone!
Best of Luck!
Layla