Hi Niki, I don't know if there's an actual average price for click rates. It totally depends on the blog itself, prices can vary so much from one blog to another! Here's all I could find :
Factors that Influence Advertising Rates
Blog advertising rates are based on a number of factors. The most important factors include:
Traffic: There are many different definitions of web traffic, but when it comes to advertising, most seem to care about page views. Many websites set their advertising rates based on cost per 1,000 page views (CPM"cost per mille). Advertisers will likely compare the CPM on your blog to other blogs in your niche to find the best value.
Size and location of the ad: Obviously, a bigger ad is going to cost more than a smaller ad that's hidden at the bottom of the page. Common ad sizes include 125×125, 120×240, 120×90, 468×60, and 728×90 to name just a few.
Subject of blog:Blog advertising rates vary greatly from one category to the next. If you're blogging in a very small niche (e.g. wood carving), you probably won't be able to charge as much as a blog covering something popular like gadgets and tech news. Your best bet is to seek out other blogs in your niche to see what their ad rates are.
Audience:This goes hand in hand with the subject of your blog. Your advertisers want to make sure the people reading your blog are interested in their products, will click on the ads, and hopefully take action once they get to their page. The more information you have on your readers, the better.
To sum it up, the only way to know if it's worth it or not is to calculate your profit margin, how much do you spend on your ad and how much traffic and sales do you get in return. Keep looking for other blogs that target your niche and see what they have to offer. Good luck with everything :)