He felt the need to pay the king for his hospitality even though it was unknown that he had received it. He was invisible when he took food and the king knew nothing of it.
He had borrowed several handkerchiefs from Elrond. He had complained of having left home without any of them. Bilbo left him 'such small gifts as he would accept' when they stopped on the return trip.
elf-friend and blessed
The Elvenking ordered his men to lock away his prisoners,"The Dwarves", in different cells around the castle and to give them food and water and to be kept there until they say what they were doing in his forest.
Because during the unexpected party, Thorin promised Bilbo 1/14th payment of the treasure in return for Bilbo's services as a 'thief'. Though Bilbo did not do much in the way of being a thief, he did save the dwarves from Thranduil, as well as help them gain entrance into the mountain. They also wanted him on the journey because it would have been unlucky to take on their journey with 13 members. At the end of their adventures, Bilbo had obviously earned his 1/14th share, so Thorin fulfilled his promise and sent Bilbo home with a chest of treasure (though it is hinted later on in LotR that Bilbo ended up receiving more).
Gandalf noticed the ring turning Bilbo crazy so he forced him to give it up and leave it behind
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Money
Bilbo snuck out of the Dwarves camp and delivered the Arkenstone to Bard.
He says that the dwarves wont give Bilbo any gold, and that the Dwarves ar ejust using him.
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Balin, the only dwarf who seems to give a concern to Bilbo's physical and mental wellness.
It is true that rubies, sapphires, and emeralds are more rare than diamonds. The reason is that the elements which make up rubies, sapphires, and emeralds which give them their color are more rare in the environment than carbon which is what diamonds are made of.