Why do DNA testing?

(*Image University of Leicester) 

I suppose there are a plethora of reasons for wanting to get your DNA tested for genealogy purposes.
The first thing people generally do, is to upload their raw data to sites that match DNA with cousins. What puzzles me, is when they do that, and are given matches, or receive emails from people they have close matches with, do they choose to ignore them?

I've taken the DNA plunge for a number of reasons, but the icing on the cake would have been that I was in touch with newly found family members around the globe, the filling in of my tree, being incidental to that.

For those undertaking autosomal testing, here is some advice for when you receive your kit in the post.
(*It is what worked for me, and I got my results first time around, rather than re-test, as many have to)

1.Do your test first thing in the morning. Before having a drink, brushing your teeth or eating.
2. When you spit in the tube, make sure that it is filled to the line with saliva, if there are bubbles, make sure they are over the top of the fill line, as when they pop, there may not be enough saliva for the testing.
3. Mix in the regent (as per directions) and post (if you are the same as me, wait on tenterhooks until the results come in).
4. Don't get despondent about waiting a few weeks, as like I said in an earlier blog-post, when you finally get them, it will have been worth the wait, it's honestly like being a child in a sweetshop :)