I mostly agree, although I use both the "become a fan" button AND the Like button; because to a large degree, when someone "likes" one of my events, whether or not they've become a fan - some of their friends will come along to see what's up too.
That's why, if you do use the "Like" button, it's important to make whatever you want them to like sound enticing. In my case, it's the page (or post if I'm using WordPress) title.
I do automate some tasks (like feeding new posts up to the blog) but I am very careful not to automate everything. You need to come across as human, not a bot.