the reality is that all SEO have used Black Hat Techniques for experimentation.. keywords stuffing, spamming, etc.. but the thing is,, is it worth it?? of course it isn't!
You will enjoy ranking high in all of your targeted keywords at first,, but surely you will be detected by SEs in time! using black hat techniques is just your putting your site in the grave.... so i strongly recommend never use Black Hat Techniques!
Cheers!
