I've been placing ads on KS for a few years now. Yes I had trouble getting all their rules straight at first and Yes I had my share of ads deleted. Once you get the rules straight and learn from a handful of deleted ads, it's not that bad of a site. I've met MANY valuable customers from that site, as I have many other "free" ones.
I guess what I'm trying to say is- if you want to promote yourself within the world wide web you can't limit yourself at all. You need to abide by their rules, it's their site. You need to find your niche among them and establish a stasis. This goes for ALL forums and sites. Bashing any of them only creates a bad vibe from them to you...and most importantly...limits you and your business that much. It's important to remember that FOR THE MOST PART whatever you type and post on the internet STAYS there forever. It doesn't get forgotten or lost. It's there for good.
Hope this helps.