Yes, one reason is respect. Another reason imho is that we completely surrender ourselves to the Guru.
"Ja o ṯa o parėm kẖėlaṇ kā cẖā o.
If you desire to play this game of love with Me,
Sir ḏẖar ṯalī galī mėrī ā o.
then step onto My Path with your head in hand.
Iṯ mārag pair ḏẖarījai.
When you place your feet on this Path,
Sir ḏījai kāṇ na kījai. ||20||
give Me your head, and do not pay any attention to public opinion. ||20||"
- Ang 1412, Sri Guru Granth Sahib ji.