I have no doubt that blizzard has someone reading these forums, even if it is just one person and that might not be their sole job
Wow is a huge money spinner and it is definately a better use of their funds to pay developers to keep those 99.999% that dont bot happy with new content and features than focus resources on that 00.001% that do bot. Ultimately they have to have something in place though to deal with botters because some botters are harrassing players with spam, destroying in game markets etc etc.. essentially going to far and becoming enough of a problem that they have to do something about it because it becomes very obvious and more importantly has the potential to attract more people into botting.
Its a slippery slope, I can totally understand why they went after BG botters and archeology bots because frankly people hate grinding those things, but if people start botting those and realise that its not something that will immediately get detected and insta-banned they will start seeing what else they can get away with and before you know it you would have chaos with lots of kids thinking its fun to teleport hack and things to steal the flag before the match has even started
I wouldnt entirely blame blizzard if they saw HB as a tool to keep those lesser offenders paying, because we do still pay our wow subscription. I believe its a very very small percentage that bot only for botting itself and do not still play the game in some capacity.
I also think blizzard were wrong for shutting down glider, it didnt stop people botting.. they just split off into several different botting communities. By leaving glider up they could have continued to detect and banwave against 1 product. Shutting them down made everyone scatter in different directions and their job is now more difficult