2 Corinthians 11:10 - Matthew Poole's English Annotations on the Holy Bible

The apostle often repeateth this, glorying much in it, that in this region of Achaia he had preached the gospel without charge to the hearers: he did so also at Thessalonica, 1 Thessalonians 2:5,6,9; but concerning them, he saith, what he no where saith of the Corinthians, that they received the word in much affliction; which might, probably, be the cause. It is most likely that he either discerned this people to be more covetous, and too much lovers of their money: or that there was a generation among them, who, if he had taken wages for his labours, would have reproached him as one that was a hireling, and who did all that he did for money. And, indeed, himself seemeth in the next verses to give this as a reason.