for this ointment could have been sold for much, and given to the poor.'

"for this might have been sold for a considerable sum, and the money given to the poor."

For we might have got much money for this and given it to the poor.

For this could have been sold for a great deal, so as to be given to the poor."

"It could have been sold for a large sum, and the money given to poor people."

Sold for much - Mark and John say for three hundred pence - that is, for about 9 British pounds.
This, to them, was a large sum. Mark says they complained against her. There was also an "implied" murmuring against the Saviour for suffering it to be done. The grumbling was, however, without cause. It was the "property" of Mary. She had a right to dispose of it as she pleased, answerable not to them, but to God. "They" had no right over it, and no cause of complaint if it had been wasted. So Christians now are at liberty to dispose of their property as they please, either in distributing the Bible, in supporting the gospel, in sending it to pagan nations, or in aiding the poor. The people of the world, like Judas, regard it as "wasted." Like Judas, they are indignant. They say it might be disposed of in a better way. Yet, like Judas, they are interfering in that which concerns them not. Like other people, Christians have a right to dispose of their property as they please, answerable only to God. And though an avaricious world esteems it to be "wasted," yet, if their Lord commands it, it will be found to be the "only way" in which it was right for them to dispose of that property, and will be found not to have been in vain.

And given to the poor - How often does charity serve as a cloak for covetousness! God is sometimes robbed of his right under the pretense of devoting what is withheld to some charitable purpose, to which there was no intention ever to give it.

For this ointment might have been sold for much,.... Mark says, "for more than three hundred pence", Mark 14:5, now if this is to be understood of Roman pence, each penny being seven pence half penny of our money, three hundred pence come to nine pounds, seven shillings, and six pence; but if it is to be understood of the penny of the sanctuary, which was one shilling and three pence, they come to just as much more: it might well be called very precious and costly ointment; and this was the reason of the disciples indignation, that so much cost and expense should be thrown away, as they thought, in such a manner, which might have been applied, in their opinion, to a better purpose. For had it been sold for its worth, so much might have been had for it,
and given to the poor; which was a very plausible objection to the action; and which they seem to have taken from Judas, who had made the same, on a like occasion, about four days before this, and he might instigate the disciples now: which shows what mischief an hypocrite may do in a church, and what influence he may have over good men to draw them into his measures, under the specious pretences of carefulness, frugality, and doing good to the poor. It seems our Lord inured his disciples to this good work of relieving the poor: they kept one common purse, and one of them, who was Judas, was appointed the bearer of it; whatever they collected, or was made a present to them, they put into this purse; out of which they were provided with the necessaries of life; and the rest expended on the poor.

This ointment might have been sold for much. Mark and John say, "three hundred denarii." Pliny says a pound, the amount in the vase, was worth 400 denarii.
Given to the poor. A pretence. Judas wanted to get the money into his bag.