Why do people comparing tullips with bitcoin  ?.

Back in the 17th century, rich people in Holland bought tullips to show off their wealth. The tullips had to be imported from Turkey, they where rare.
Back then, having tullips in your garden is the same thing as having a Lamborgini in front of your house. Looks nice, but it's kind of useless. Nothing more, nothing less.

Oh btw, back then we had gold and silver coins. With other words, there was no reason to store your wealth in flower bulbs.