Sannyasa Ashram: False Renunciation

                                                                  Q. The word 'sannyasi' means one in the renounced order of life, which also means being away from homely comforts. But how is that some sannyasis [gurus] hold administrative positions and material assets [fixed and liquid], accept material gifts and tend to lead an opulent life style [taking very opulent prasadam, jet traveling, doing shopping during foreign trips etc.] Is it that if one is spending 24 hours of his time in Krishna consciousness, he is exempted from the above rules?

                                                                  Q.  Renunciation of prescribed duty is condemned in the Bhagavad-gita As It Is verse 18.7, 18.8. Also in the purport to verse 3.4 Srila Prabhupada disapproves premature renunciation, but then he gives the bottomline, "On the other hand, if someone takes to the transcendental service of the Lord, even without discharging his prescribed duties, whatever he is able to advance in the cause is accepted by the Lord."
                                                                  So, isn't Prabhupada giving a license here especially for students who want to practice bhakti as an escape-way to studies? Please explain the matter briefly and remove my misconceptions. I beg for your help.