Letter to an alien spammer

Someone calling themselves oxsumms
of dwpyuwvbdbfq.com/
giving the e-mail address of datakt@glfrag.com

Attempted to post the follow spam comment on my blog this morning.

qzwsPE ntrdcanlqxxc, [url=http://qadfozdfvdvs.com/]qadfozdfvdvs[/url],
[link=http://uuicltrgblpo.com/]uuicltrgblpo[/link],
http://edqnyngtpngu.com/

I usually delete about 4-5 such spam comments each week, identical in form, though using different combinations of nonsense letters and nonsene URLs.

I'm just curious about why these are being posted? What's in it for you? What reward is there for such futile and meaningless activity?

I suppose it is just possible that somewhere in a galaxy far far away there is a language in which "qzwsPE ntrdcanlqxxc" means "Enlarge your nine penises", but what mere earthling could be expected to understand it, much less be tempted by the offer?

So what does motivate people (or extraterrestrial space aliens) to engage in such futile, meaningless and apparently unrewarding behaviour?

Enquiring minds want to know.