It boils down to the trust for the project - it's not big of an amount if everybody will get something out of it in the future.
These funds can be used either for the future or just to get a quick buck, we will never know.
Some use TON fees to get the NFTs on the blockchain and to pay rent for them, usually for a year or two (that would be ~0,12-0.13 TON, but it depends).
Again, agreed. But what guarantees that the project will pay me? This is the main concern.