We have an astonishingly high posting/responding rate here. That is very welcome, but sometimes the sheer volume can be overwhelming.
We could reduce some of these responses a little if people didn't put up responses saying "Please PM me...". This is especially the case where many people post the same "Please PM me..." responses! We could as easily send a Private Message to the person directly.
If they are happy to send a PM, then I am pretty sure they will not mind whether the request comes from a response or as a PM. We also make it easier for people to send the PM back because they only have to answer the PM they received. Finally, some of these responses will be missed by the person being asked, especially if they are not threaded properly.