We all hunt for backlinks and there are services around the Internet, which are providing backlinks and they are having it as their full-time businesses. So, backlinks generate a good business.
Since, all are up to backlinks – and not actually thinking that which backlink will count in and which will not – as all this is controlled by search engines and they are solely responsible for making things acceptable or unacceptable.
If you are placing comments of blog – and keep a watch that you are placing comments on normal blogs – since they have any dignified way of linking to other sites – but if you place comments on autoblogs they are just like link-farms and they provide backlinks to n-number of sites.
Therefore, the qualify links are the only ones that count in and the other backlinks are ignored. Most likely go for only quality backlinks for your site.
As in juice has to be present with some website and then only it will be passed to you – and if they are linking more – they will lost their all juice and none will be passed – and all such links present on any website are simply ignored by the search engines.
Backlinks are good enough but on the other hand they are the risky ones too – if you place it correctly – it would enhance your search engine ranking and if you mess with it – you will probably be de-listed from search results.