Spams, spammers and spambots are exist for only one purpose, money.
1. Spam is email that is sent to other people without being requested. Why they want to disturb our life? Because this is one way of advertising.
2. Spammer will mostly send you something that you don’t know and don’t want to know, and turn to make you know, which equal to advertising. Advertising agency usually get paid for publishing advertisement, newsletter, social announcement and many more, so do spammer. Spammer get money for doing advertising on bad things like replica stuffs, pills, porn, multi-level marketing etc. In short word, spammer is ‘bad advertising agency’.
3. Spammers are not stupid. They have capabilities to be hackers, software developers, system engineers, researchers who tend to get more money which will bring themselves happiness, with less effort. They know how to do things right, do automation for their spamming task, bypass all security features and build many ‘add-on features’ in order to bring the ‘advertisement’ directly to you.