My name is cdc and I've been doing SEO for a few years, but I'm new to domaining. I own about 500 domains, but none of them get a substantial amount of traffic. Most of them are two word phrases that receive 50-100 visitors per month.
Welcome to whizzbangsblog.com forum. Just to let you know 50-100 uniques a month times 500 domains is between 25-50K per month and is a reasonable amount of traffic. If optimised these should earn about $1500 per month.