I used a service because I was worried about my privacy.
I did not want previous people  I transacted with on the same wallet ID to check my wallet ID on the blockchain and see that I had such a large amount of money. I felt it was high-risk to continue using the same wallet for smaller transactions with peers, friends, etc.
I felt it was high risk to have a large volume of btc associated with smaller transactions involving names, etc.
It was like walking around with my bank balance on my forehead, to the people who had my walled ID.
Looks like what I feared happened anyway.