How are you playing it? I tend to get more coms as a Healer than as a DPS. I also try to be fair and only doll out to those I feel have performed their role best. I think with the Tank at the forefront and still being in higher demand as a class a few people feel commendations are an active encouragement.
When I am healing I try to use my initial buff cast time to say hello properly and get a feel for the party. Sometimes people are responsive and that can lend to a very fun run other times I just look like I am talking to myself... which amuses me if no one else and at least I feel I have made an effort.
Its always nice to receive commendations but don't let it get to you if you don't. It's an additional feature not a required one. If you know you are doing a great job and your FC and Linkshell's are happy with what you do, don't worry about it.