In my opinion you have to chalk the seriousness in LHP up to 2 reasons, at least when it comes to the ritual itself.
Visualization to direct energies takes strict concentration, humor and jest breaks that concentration completely. Don’t believe me…go to a business meeting and rip a good juicy fart in the room. After the laughter has died down, apart from the smell, all concentration on the matter at hand is gone. The same applies to ritual. Strict concentration is key to success.
Dealing with malevolent spirits requires a degree of respect for them and yourself as well as being disciplined in your request and interaction with a spirit. If they think you are a joke, they will do nothing for you. They have to know your power, and you have to realize your own power and potential. This strictness isn’t always the case once a relationship with a particular diabolical spirit has been established however. As an example, I have a good working and pleasurable relationship with Lilith, and she for one gets extremely turned on when I call her “My filthy demonic whore, slut. fuck this cock you devil bitch…ect.” you get my point. I’m sure she isn’t as nearly accommodating with that dirty talk with just anyone who wishes to summon the all powerful Duchess of Hell, bringer of sexual destruction and chaos. But with me she is
Where humor is definatly required is post ritual. One of the worst things a sorcerer/magician can do is be all broody and dwell on the ritual they just finished. This will draw away the power of the ritual, cast doubts in their mind and ensure failure. Humour, socializing, whatever it takes to draw their attention away and forget about the ritual completely and let the spirits do their thing is the very best advice I can give newbies.
I, as you can see, am at ease with working in the LHP. Some like to look the part and “fake it, until they make it” by being all black and serious and gothy. Its a show and they have no real power. Its their thing, and they want to give an aura of superiority and seem like they are bad-ass black magick users. Inside, most of the time they have low self-esteem and the spirits can sense this every time.
My thoughts on it. Have a nice day.