I`ll back you guys up here. $89 for 30K visitors is just like the snake oil salesmen selling you a 30K email blast to a list for $89...
Spend the $89 on Google Adwords or Yahoo`s Pay Per Click Programs. You`ll be much much happier!
The good news is that every webmaster has a simple metric to track junk visits. Watch your click to purchase conversion. Niche sites should have a conversion rate of no less than 20 percent and more broad online stores should be seeing 10 percent of visitors buying an item. Anything less may be a sign that the current advertising strategy is not working.
One very important item to keep in mind is that your conversion rate is not even across the board. Are visitors from Google or a certain affiliate giving you a higher conversion rate than elsewhere? Is it on a certain day or are they from a certain area? (IPs will tell you what area of the country or world a visitor is coming from, unless they`re using a proxy) Shifting the distribution of capital and attention in your existing marketing partners may be much better than buying more ads in a site you don`t know about or hiring a "SEO firm" that may just use bot scripts to boost your hits/ranking that will draw the ire of Google or Yahoo.