When I began blogging with blogspot some years ago (too many) it was like the wild west...
Everybody commented (as in spammed their urls lol) on each others blog - I'm talking porn soft and hard...
I certainly did and would spend a couple of hours doing it...
Back then I made good mates and contacts by not being too spammy...
However nowadays I have found 99% of comments from so called "fellow bloggers" on my blogs are 100% spam - their blog/splog url or whatever...
To that end I let akismet deal with them...
I also think that nowadays in porn in particular most bloggers view comments from other webmasters with a high degree of suspicion - I certainly do lol...
Where do you draw the line..?
Blogger comes to your blog (one of 1000 he hits that night) writes "hot babe I love her" - leaves his url...
You approve it - is that not a free link back for him..?
If it isn't why do people do it..?
I'm torn on this one - I like to see contact from my surfers - and like to give half decent blogs a mention where appropriate...
I have contact forms on most blogs that actively encourage bloggers/webmasters etc to contact me...
But spam is like walking into your house uninvited and turning over the TV...