I was talking about this just last night. Some friends here in Shanghai screw their tip into the hard floor before putting it with the tip facing down in their case... I don't get it... (well, one dude has a tight case, and screws his butt into his shaft and then unsheathes it from his case like some knight wielding excalibur... so kind of get that, not that I would do that personally)
Spend all this money on a fancy tip, spend time shaping it, and you want it to hold as long as possible... then jam it into the floor, and leave it pressure downward in a case?
I never wipe chalk off the tip (occasionally prick it with a tool if it gets cakey). I wipe with a tissue before shaping. I place tip up in my case.