Okay, I understand that bolding keywords might help you rank higher in search engines for that keyword, as you are giving importance to it, but I am pretty sick of reading blogs that bold every keyword or phrase they want to rank well with.
As a regular visitor, I find it distracting to see so many words bolded. And I really think it makes the blog look spammy and unprofessional.
If you want to attract attention to key words, use them as section headings, bold them once or twice, but not all the time. Otherwise, I won’t be coming back, and I am sure there are others that will agree.