I know the big reason to mine now is the payment of coins.. But what about transaction fees?

If I am part of a mining group, I will get a fraction of a coin based on how much hashing power I contribute.. but how are transaction fees paid out? Is this something that can be expected to go up as time progresses and more people are using Bitcoin for transactions(like now!)...


I understand pretty clearly the mining aspect of being a miner.. But what about the end goal of just being a transaction processor? What kind of money and how do you make it??

Thank you in advance for any replies.