If you want that character to retire or arent playing seriously anymore, then yea. Get to level 81 and go on a mass killing spree! Then give yourself a pat on the back.

i did it once, after a few quests i started to regret it. It takes the fun out of the game once your a beast that can one-shot everything

No but i have a RL friend who did so i knew that i never want to do it, saved me a lot trouble of boredome.

I use it the one time when the quest involving it is completed and that's it. That way I feel like my characters "earned" it (like the idea of actually earning something truly worthwhile is possible in a video game). I'd rather just level by actually playing the game.

I once did the Soul Trap trick with a character starting at around level 3, all the way to 100 in the skill. I think I was around level 25 by the time it was done. I was only able to play a few more levels after that because I was all but invincible. "Oh look, enemies. I'll just summon two Dremora Lords and watch." I quickly realized it wasn't a lot different than watching someone else do the same thing on a Youtube video.

The book does indeed look pretty cool.

Exactly. Why go straight to level 81?

For messing around, I have two for messing around and seeing how much I can exploit and get away with and I have two for legit play