You put a link on your site to mine and I'll put one on my site to yours. Sounds fair doesn't it? Ha! but there's a catch!
What if you are an honest Joe like me and believe the person on the other side is honest and you do your bit by adding the link to the other guys site but ... back at the ranch ...
- S/he never adds the reciprocal link back to you. You've been had!
OR - S/he sends you and email saying "here's the page with your link ..." but the page with your link is not linked from anywhere else on this person's site! You get it? Your link is on the other site but the page it is on can never be found on that site ... you've been scammed!
OR - S/he waits for 2 weeks then removes your link but you still link to him/her. Scammed again!