The virtues of saying labbaik
In order to encourage you two of the holy ahadith are presented here:
(1) Hadrat Syeduna Abu Hurairah has narrated that when a person says labbaik, he would be given glad tidings. It was asked: Are the glad tidings of Paradise given? He said: “Yes”’ (Al-mu’jamu al-aousath lil Tabrani, Volume 5, Page 410, Hadith 7779). 
(2) It was narrated by Hadrat Syeduna Sahal Bin Sa’ad that the Rasol e Akram sallallaahu alaihi wasallam said: “when a muslim says labbaik, the rocks, vegetation and mounds till the end of the bottom of the earth at his right and left sides all say labbaik.(Sunan al-Tirmizi, Volume 2, Page 224, Hadith 829).