That's a highly valid point. Same goes for if it's a clients site.

You might be joking but I've seen comments like that haha

Such services are often easy to spot I think

You'll probably get some complaints by blog owners, and it really doesn't do a lot anymore anyway. Most of the links will be either removed fast, the ones that stay will be on blogs that aren't maintained and are therefore full of thousands of other spammy links for Ugg boots and viagra, and the rest will be on blogs that are both irrelevant and practically worthless in terms of what it will give you.

You could always just find a few decent blogs that are dofollow, give a good response and add the link yourself More likely it will stay that way.

A bit of each if you're limited like that... if you've already got the A grade for the keywords then I'd focus on link building mostly. Maybe an hour on the on-page (as long as your content is right already) and the other seven on links?

You'll still need to do more later though.