Yeah google just likes stuff that looks natural.
the safest way is to build 10 backlinks per week. It looks natural to google and your site will be safe…
I think 10/day is too low. Out of the 10 backlinks, the search engines may not pick up half the links.
I think it’s more a balance game of quality and quantity. Blog commenting can generate quality backlinks, but it’s hard to find blog post on the same topic. Forum discussion is not really quality backlinks, but easily get 20 to 30 links.
In my point view, quality is matter and not quantity. you should create quality and relevant back links rather creating huge amount of irrelevant back links.