MyBB Community Forums

Hello. 

In some another forum (SMF), I am seeing increase in number of their visitors. But the thing is, it doesn't seem natural, their daily number of post is so low (like 10-20) but their daily hits are between 50k-80k. When I check what visitors doing on who is online page it looks like most of the users are checking random user profiles (some of them even has 0 posts).

So, these are my questions : 

1. Is it possible to cheat to show high number of visitors? (SMF) If so, how can I prove it?
   
2. Is it possible to manipulate site ranking websites (such as Alexa) with cheat?
   

I am really surprised, those forums are dead and their ranking in Alexa is increasing. I am reminding you, those forums are getting maximum 50 daily post. Yet they have very high number of visitors and hit. What is the deal?