Just to give a test, I bought a pack of 5 screw-on pool cue tips at WalMart this week because for $2, they were cheaper than the $5 glue-on repair kit. (I also bought a $15 cloth from the Crafts Department to recover my pool table, and, with 97% nylon, I'll see how long it lasts.)
The pack has 3 tips at 12mm and 2 tips at 13mm.
3 of the tips are already screwed into ferrules.
I've installed one by simply drilling a hole into the end of the cue. Is there supposed to be a "female", metal receptor already? I'll probably never need the ferrules, and I wonder if they'll always fit what my cues have already.
I don't know if the tip will be as solid as one with glue would be, and I don't understand what the advantage of instant installation of future such tips would be. Softer tips for jump shots? Harder tips for break shots?
Update: I ventured out to answer my own questions.
It appears that the sole benefit is to be able to switch tips while you play (and prevent needing to carry multiple cues), either because of damage or to get a different hardness of tip for various shot objectives.
The market has shrunk, causing most screw-on pool cue tips sold to be too hard.
My installation method probably won't last (without the metal female receptor), and for now I'm just going to use the screw-on tips on my one-piece break cue.