Paul's journey to Rome.

One of the things that strikes me about Paul's journey to Rome is all the freedom he had.  He was allowed to go visit people along the way and he was trusted to return to the ship.  Once in Rome he got to live in his own house for two years. 

Acts 28:30-31(NKJV)

Then Paul dwelt two whole years in his own rented house, and received all who came to him, 

preaching the kingdom of God and teaching the things which concern the Lord Jesus Christ with all confidence, no one forbidding him.

And yet in the end Paul is killed for Christ.  To what purpose one might ask?  He was free to preach for two years in Rome before they finally get around to dealing with him.  The question in my mind is why didn't God just let that continue? 

My guess is that at some point there was more value in Paul being martyred than in Paul continuing to preach.  It was all the same to Paul because his heart's desire was simply to be obedient to God and spread the Gospel of Jesus in any way he could.  That is one of the things I admire about Paul.