I just took a look at my address transactions and found that the older ones were having confirmations greater than 5000 while other was having even more that 6000. What is the use of having that much confirmations ??
Each time a block is mined, there is one more confirmation.... That's just the basics of bitcoin.
Your transaction goes into a block, and has one confirmation, a next block is mined on top of the block containing your transaction => 2 confirmations,....
Having 5000 confirmations just means that there are 4999 blocks on top of the block containing your transactions