1. yes bandi's goal with this tamagotchi is to have people bump, you can buy a cheep tamagotchi friends on amazon' the ones you can find on there are in great condition and are more less money than the ones you can find at the store.
2. yes I know trying to unlock the 5th is hard, but i was able to unlock it with bumping
3. yes I believe that once you bump, more jewels will open up for you to buy.
If you have anymore questions ask me :3