When I say chattel slavery, I mean that these slaves bought and sold like property, like the slavery of Colonial America (And as I understand it, this form of slavery is the oldest, so I imagine there are a lot of examples). How wealthy was the average slaver? The guys who go out and capture slaves? Also, how were slavers perceived by their peers? Were they considered normal? Were they hated? Was there some kind of nobility in the job?
Most forms of slavery throughout history were not chattel slavery. Chattel slavery is defined mostly by the fact that, not only were slaves property, but there was little to no chance of ever being free, and any children would not be free either. Until the importation of African slaves to the new world, most societies did not use chattel slavery. Even afterwards, many African and Native American people continued to hold slaves that were not chattel.
As for the rest of your question, slavers and slave traders were generally held in some contempt by their peers. Slave traders were considered a necessary cog in the machine, but not necessarily a respectable one. It was certainly lucrative, for most became pretty wealthy. Many then became plantation owners in their own right, as an attempt to switch to a more respectable career path.
Now, in Africa, where many slaves originally came from, slave catchers were often Africans themselves. They could be warriors or representatives of one of the African empires that dealt with Europeans. Africa itself is not my specialty so I'm not entirely sure how they were viewed by their peers.
You might want to check out Walter Johnson's Soul By Soul for a detailed look at slave trading and slave markets or Ed Baptist's '"Cuffy," "Fancy Maids," and "One Eyed Men"' for a more detailed look at that activities of slave traders in the nineteenth century United States.