Only the very cheapest cues will have screw-on tips. If you are getting a cue for the very first time and you really don't know what you want, these cheap cues can at least provide you with an experience on what to avoid in the future.
Two main problems are:
The tips are very soft and quickly mushroom.
After several cue ball hits, the screw tends to loosen. Miscuing is easy to do.
This type of stick could only be found attractive by first-time cue buyers who do not have any one available to mentor them. A decent inexpensive cue will be at least 10 times the cost of the cheapie screw-on tip stick.
There is only one circumstance under which it might be useful to have such a cheap cue. When you are first getting started, you need to build up hundreds and hundreds of strokes. You can do this at home with this type of stick, and some tennis balls on a table covered with a blanket.
With these tools, you can begin to get comfortable with a bridge and moving the stick back and forth in a straight line. With the tennis balls, you can shoot them to a backstop at the other end of the table, shoot one ball into another and try to get the second ball to hit a target on the backstop. With this, at no cost, a newbie can stabilize the basic fundamentals.
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