I don't know why it's so fascinating. Back in college I'd stick my head in the closet and just watch em grow. My roommate would come home and exclaim "you're staring at those things again!".
It's fun managing the light, tempurature, nutrients. Selecting the plants to grow. Wildly fast growing Sativa strains or the slow growing Indica. I didn't smoke the stuff either. I was the farmer, my roommate the user. I guess it was a symbiotic relationship.
It was scarry as hell when the police showed up at our door. They started talking mumbo jumbo to me when I opened the door. I guess they were trying to confuse me to see if I was stoned. I starred at them and said "what are you talking about".
They straightened up and said they have a report of a "black light Marijuana plant" and asked if they could search our room. I thought to myself "full spectrum and plantS" but I asked what would happen if I said no. They said they could come back with a search warrant. I of course said they'd have to come back.
My roommate and I were paranoid until deep into the night that they would have us staked out for when we tried to ditch the plants. We eventually successfully ditched them. The next day we went out and got a couple porno magazines and pasted the pictures all over the inside of the closet. We also put a chair in there and a bucket to make it look like a wank-off room. Thought it would be hillarious for when the cops came back but they never did. We could have kept growing! Damn.