I think that the difference is that tulip bulbs have very limited usefulness. The ability to hold and spend "money" on goods and services has more value than a pretty flower.

Plus there is not just bitcoin. Many other coins are more useful for shopping etc. Once the grandma ladies like me find out they can buy a cup of coffee with money that increases in value - they will be in.

I think this is proven by sbd losing its peg. The value won out and asserted itself. I hope I'm right and I don't see this "mania" stopping anytime soon.