There is someone else on the other end. I had one of them previously get on the forums I worked on and complain about how quick I was to blocked them. I wrote an entire system for learning the patterns and automatically blocking them as they occurred. Eventually I determined that the vast majority of the IP addresses originated from Bangladesh so I just banned the entire country from accessing the web sites. That was the only solution, unfortunately for those legitimate users there, that made the spam stop for good.
I assume SEO targeting and associating phrases with various products. For example, people on Reddit will name and shame by dropping people's names accused of crimes next to the thing they are accused of in a complete sentence. This is an attempt to promote the relevance of those two facts in Google Search to each other.
The automated spam tends to be for financial gain somehow, Either by spaming links thinking someone will click them or SEO stuff. The non automated spam is usually people who find enjoyment in being annoying
I recommend reading the book "Spam Nation" by Brian Krebs(sp?). He goes into the different motives behind spam, the big actors, and how people get paid for creating spam.
i have the same experience, exclusively bangladeshi and indian IPs signing up to enter SEO spam for small businesses in the US (insurance, hair salons, lawyers, house renovation etc etc). Stopforumspam has most of them in their lists.
