When playing the national lottery, some people spend their own hard earned money for a chance to win. Some buy ten tickets, some buy one. It's not your fault you haven't been in chat earlier, no, but that's my way of rewarding those who have been around. As for yourself, you can either have six names in the hat by the end of the year, or none. I can only guess at which would give you the better chance of winning.
Last I checked, this is a generous offer that rewards little effort and you're not being charged a penny. There's that saying about looking a gift horse in the mouth, I'd say this applies.