It is difficult to get advertisers for those bloggers who uses nofollow on paid links and paid posts. This is the main reason of why most bloggers still gives dofollow to paid links and paid posts. In selling links and advertisement space, I prefer to follow google’s rules as I don’t want to get any penalty. I had bad experience of losing PR3 to PR0 for my earlier blog which never able to get PR even after 1 year. Page rank system gives credit to my commentators because this is a keywordluv dofollow blog. Comments are the fuel for our blog.
To support this blog, I just need $10/month to pay my hosting bills and another $10/year for domain. Whenever we see other blogger’s monthly earning summary, it motivates us to further monetize our site. In desperate situation we tend to give dofollow link to advertisers. Personally, I suggest don’t give dofollow link to advertiser. There are plenty of ways to get high PR dofollow backlink.
Advertiser’s main concern is to bring targeted traffic. If your blog stays in your niche and have good traffic, I’m sure it will be easier for you to find advertisers. So, try to increase your traffic. It is the only way to attract nofollow advertisers. Do more search engine optimization, link building, reduce bounce rate and increase all type of traffics (search engine, direct, referral). Search engine traffic commonly referred as best free traffic. Provide more keyword rich contents in your blog consistently. This will do some SEO magic on low or unique keyword search traffics.