Yes, but the question is, what would have happened if I, someone else, 5, 10, or more people reported you for sending unsolicited PMs? Would you have received a temp ban or maybe a permanent one? Or would the admins not have looked at it that way at all or simply warned you to stop?
This is where discretion comes into play. The staffs would not simply react based off the number of reports and but consider the situation before deciding whether or not any punishment is necessary and what it would be. AFAIK, the content of the message also matters, is it spammy or of no value? Does it advertise a website? etc.
That's what I thought. It comes down to whether or not it will get reported. The consequences will depend on the friendliness or assholeness of the PM receiver and the mod making the call.
As I said above, the consequences would also depend on the content of the message. I have sent unsolicited PMs asking a more experienced user for help on some issues and while it was unsolicited, it was not spammy or annoying. I would assume the mods would consider that if it dies get reported. 
