All occupational engagements are certainly meant for ultimate liberation. They should never be performed for material gain. Furthermore, according to sages, one who is engaged in the ultimate occupational service should never use material gain to cultivate sense gratification.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
धर्मस्य ह्यापवर्ग्यस्य नार्थोऽर्थायोपकल्पते । नार्थस्य धर्मैकान्तस्य कामो लाभाय हि स्मृतः
dharmasya hyāpavargyasya nārtho'rthāyopakalpate | nārthasya dharmaikāntasya kāmo lābhāya hi smṛtaḥ
SB 1.2.9