Hi,
I am sure you have heard of Google Penguin Algorithm that rocked many of the webmasters that use paid links to try and connect their websites/blogs to certain keyword terms.
- The big issue was the amount of paid links set in their SEO Footprint. Google busted a truckload of websites that showed heavy footprint for paid links.
Don't be afraid to pay for links to high-end directories like Yahoo.Com, Business.Com or any of the directories SEOMOZ list. Also try to do only a few every 90 days.
If you want great traction to your website, you need to start a content algorithm. Meaning you need to do some research and determine what pain-points your potential target audience has and start figuring out a conversation you need to have with them. That means both implicit and explicit thoughts.
Build out a frame-work of content first and then come up with a plan for syndicating the content.
Find communities or follow experts in your niche and reach-out to them to host or sample your content to start generating natural links.
Overall to answer your question. You can do paid links. However, do paid links of quality. Directories, Press Releases. Vary your anchor terms and do not a ton of paid links every 90 days.