Your problem is that you are ignoring the rest of chapter 9. When you take the whole of chapter 9 together, you will find that the other passages you post have nothing in common with the context of Paul defending his ministry. For what he says, apparently people were questioning his identity as an apostle. And why? Because he is eating and drinking, and is showing himself to be human. Is any of it sin? You have to read what he says, as he defends himself.
"19 For though I am free from all
men, I have made myself a servant to all, that I might win the more; 20 and to the Jews I became as a Jew, that I might win Jews; to those
who are under the law, as under the [
e]law, that I might win those
who are under the law; 21 to those
who are without law, as without law (not being without [
f]law toward God, but under [
g]law toward Christ), that I might win those
who are without law; 22 to the weak I became [
h]as weak, that I might win the weak. I have become all things to all
men, that I might by all means save some. 23 Now this I do for the gospel’s sake, that I may be partaker of it with
you."
Context. The section we quoted follows the above. The version you posted starts in a way that shows that his statement is an elucidation of the previous section. Completely changes the meaning, doesn't it? The other passages you posted no longer fit in the broader, actual context. If you are still having difficulty, then read the whole chapter as a continuous context, since it is.
"1 Am I not an apostle? Am I not free? Have I not seen Jesus Christ our Lord? Are you not my work in the Lord? 2 If I am not an apostle to others, yet doubtless I am to you. For you are the [
a]seal of my apostleship in the Lord.
3 My defense to those who examine me is this: 4 Do we have no [
b]right to eat and drink? 5 Do we have no right to take along [
c]a believing wife, as
do also the other apostles, the brothers of the Lord, and Cephas? 6 Or
is it only Barnabas and I
who have no right to refrain from working? 7 Who ever goes to war at his own expense? Who plants a vineyard and does not eat of its fruit? Or who tends a flock and does not drink of the milk of the flock?
8 Do I say these things as a
mere man? Or does not the law say the same also? 9 For it is written in the law of Moses, “You shall not muzzle an ox while it treads out the grain.” Is it oxen God is concerned about? 10 Or does He say
it altogether for our sakes? For our sakes, no doubt,
this is written, that he who plows should plow in hope, and he who threshes in hope should be partaker of his hope. 11 If we have sown spiritual things for you,
is it a great thing if we reap your material things? 12 If others are partakers of
this right over you,
are we not even more?
Nevertheless we have not used this right, but endure all things lest we hinder the gospel of Christ. 13 Do you not know that those who minister the holy things eat
of the things of the temple, and those who serve at the altar partake of
the offerings of the altar? 14 Even so the Lord has commanded that those who preach the gospel should live from the gospel.
15 But I have used none of these things, nor have I written these things that it should be done so to me; for it
would be better for me to die than that anyone should make my boasting void. 16 For if I preach the gospel, I have nothing to boast of, for necessity is laid upon me; yes, woe is me if I do not preach the gospel! 17 For if I do this willingly, I have a reward; but if against my will, I have been entrusted with a stewardship. 18 What is my reward then? That when I preach the gospel, I may present the gospel [
d]of Christ without charge, that I may not abuse my authority in the gospel."
