It is ok, but Why would you feel, someone is trying to sell something?!
Any ways, to me it is quite clear.
Why did Jesus come to World, according to Scriptures?
Then Jesus said, "I have come into this world to judge it, so that those who are blind may see and so that those who see may become blind."
So, the work of Jesus was to cure the blind. Not to do any miracles:
But Jesus replied, "Only an evil, adulterous generation would demand a miraculous sign; but the only sign I will give them is the sign of the prophet Jonah.
So, if the Author of Bible wrote, no Miraculous sign will be given, why would then, they describe so many miracles?
I mean think about it. If the Writers of Bible, were trying to write myth about a person who has been doing so many Miracles, why then, they have written, Jesus said He would not do any Miracles? That would repudiate their nice story, doesn't it?
You think, the Authors of Bible wrote something to sell. They wanted to show, there was a Jesus who was doing Miracles. So, why they said, No Sign shall be given?
Cannot the Authors themselves answer that question? I feel they did:
He told them, "The secret of the kingdom of God has been given to you. But to those on the outside everything is said in parables
so that, "'they may be ever seeing but never perceiving, and ever hearing but never understanding; otherwise they might turn and be forgiven!'"
Then Jesus said to them, "Don't you understand this parable? How then will you understand any parable?
So, how do you know, those other Miracles are not parables, and the Author is testing the reader?
Jesus said, " let the dead bury their dead".
The Author did not say, 'dead' is a parable for unbeliever and misguided. So, how do we know, when the blind was cured, 'blind' is not a parable? It is not like every time, it says, here is a parable, right?
The Bahais rely on Bahaullah. See, how He matches all the Prophecies? He said, He did not study, and did not have books, and did not go to school to learn the things He knew, and yet, the history, does not contradict His claim. The history confirms His claim. So, how Bahaullah knew the details so well, to convince others, or as you think, to sell? What was He after? Money? Power? Women? How would history answers these questions? Should we look into history for answers, or our fancy and imaginations?