Your original content is critical to your success as a business owner. Fresh, unique, original content is an absolute must for you and your online followers will come to expect that same high standard every time you post new content.
Many people will only write a single guest post for any one blog because they are writing the posts only to get the links. They are only interested in one-post gigs. This was always a flawed idea, but with the latest search engine algorithm changes, it is potentially disastrous.