A request at astatalk is a warning only: somebody wants your book for free. What you have to keep an eye on at astatalk is releases, which means somebody is offering your book for free.
What I do...
I joined astatalk under a dummy email. I do not post. Ever. Because the moment I do, astatalk will have my IP and could potentially ban me (which happened to a writerly compadre). And so I lurk, following the links to pirated copies of my books at the download sites (filehat, zippyshare, etc) and send my take-downs (through my writerly email) to them, the source. I keep a copy of my generic take-down letter on my desktop so all I need to do is fill in the new link and copy/paste into their report/complaint/contact-us. Takes all of 5 minutes out of my day. Depending on the file sharing site, the file can be gone in as little as a couple hours or as long as...Hm...I've got one up now that's been waiting to be taken down for almost 4 days? But I think that's because of the weekend (not business days).
If it's your first time sending a take-down letter to a specific file sharing site, check their requirements and follow them to a T. If they require the inclusion of a particular sentence, c/p that bad boy into your take-down letter. The only time I would ever recommend not following their requirements is when those jack*sses demand your "TRUE NAME" which IMO is just a sly trick to try to sway you from bothering them with complaints about wholesale theft (which is what pirating is, AFAIC). I've been dba (doing business as) Kari Gregg for quite awhile now, for business purposes my "TRUE NAME" is Kari, so that's what these sites get: Kari Gregg. Zero problems with the take-downs thus far. You will need a P.O. Box unless you want the file share sites to have your home address, though. I've yet to stumble across any file share sites that didn't ask for an address + phone.
That said...I'm still fighting them tooth and nail (not just at astatalk), but you may as well be prepared. As soon as you have a pirated file removed, they'll upload another one, maybe 2 or 3. Or 10. I've seriously lost count of how many times my Spoils of War has been pirated. (A lot.) And filehat has a counter so when your book goes up there, you'll know exactly how many copies have been downloaded, which is the worst. File sharing sites should not have counters, evah. Much writerly crazy-making ensues.
But I think it's important to keep sending the take-downs. Don't give up. That's what they want: to wear you down so they can have at your hard work with impunity. Don't let them.
As for the belief that pirating is sort of a backhanded compliment or a measure of your success...Golly gee. Being considered worth stealing has always been one of my writerly goals. [/sarcasm] Er...No.