Back to the question why. Back to the question why does it matter if you attend church regularly or not:
First, it encourages your pastor if you attend. I know we adults should be beyond the need to need each other for encouragement -- then again, no, that's not right. The Bible tells us to encourage each other. It means so much to your pastor (and his wife) when you attend. Since I am a pastor's wife I think it's important that the pastor is encouraged.
Second, the church body needs you. We need each other. We're a family. If we don't spend time together regularly the bonds we have with each other weaken. You may not feel like you really need your church that much, but you do and you will.
Third, not only does it encourage the pastor, it encourages everyone when you attend. The fellowship, the interaction with each other lifts all of us up. We need to share smiles. We need to share hugs. We need to pray together.
Fourth, you need to hear good teaching from the Word of God. Even if it isn't the best message it is going to make you think. It might get you in the Bible. It might answer questions you have. God knows what you need to hear and can use the exact same message differently in every person who hears it.
Fifth, and most importantly, you need to worship God corporately. Sure, we can worship God anywhere and we're called to do this, but God created us to be in concert with each other. He wants us to worship together. To lift our voices together. To look to Jesus together.
Sixth (which goes along with the last one), attending church is honoring the Sabbath. When we take the time to attend church we are saying our time belongs to God. We are telling Him He is more important than the other things we want to do on Sunday morning. Isn't God worth that?
Maybe try it for a year -- attending church weekly -- and see what happens. God will use your faithfulness to bless you and others. You are so important to God and the Body of Christ. Happy New Year.