Well hopefully you're using an alternate e-mail for all your CL posting needs and you're using a proxy. Yes, you'll get plenty of threatening e-mails but it depends on how you make the ad look and what you're directing people to.
You have to make it look legit and real so that people think it's a legit opportunity. As for getting in trouble, the most that will happen to you is they'll flag your post and you'll get banned from that IP probably.