Jamieson, Fausset and Brown on 2 Corinthians 11:7

7. Have I--literally, "Or have I?" Connected with 2Co 11:6, "Or will any of you make it an objection that I have preached to you gratuitously?" He leaves their good feeling to give the answer, that this, so far from being an objection, was a decided superiority in him above the false apostles (1Co 9:6-15).

abasing myself--in my mode of living, waiving my right of maintenance, and earning it by manual labor; perhaps with slaves as his fellow laborers (Ac 18:3; Php 4:12).

ye ... exalted--spiritually, by your admission to Gospel privileges.

because--"in that."

gospel of God--"of God" implies its divine glory to which they were admitted.

freely--"without charge."