The term social networking comes to mind here as we've all been to gatherings where we are there basically to derive some benefit for ourselves. Contacts are made, business cards shared, you can help me and I can help you, possible resources and referrals are gathered.
The two teachings here really should be taken together. The feast that God has invited us to we surely cannot recompense back to Him. The feast that we invite others to should be similar. In a greater context the feast that we are inviting others to as Christians is the Lord's feast, it should not our inspiration to host such an effort in order to derive personal benefit.
Three seemingly unrelated stories that may have a common thread: presumed positions at a feast. There is the man that presumes that he is a much honored guest. There is the man that presumes that he'll receive recompense from his own guests. There are many men that do not accept the lord's invitation presuming that there are more urgent priorities yet awaiting. I doubt if the Lord is just discussing diner etiquette. The feast in this case is His triumphant wedding feast. The thread of teaching is the presumption of who is there, why they are there, the presumptions they make going into it, who is willing to accept their truthful position.
2012 - pBiblx2 Field Wise Bible System Version 2.0.9d - GPL3