Do expensive cues and fancy shafts, gloves, and all that other stuff make you play better at the end of the day?
In retrospect, I should have tried to steal a good house cue somewhere, invest my money in good tips, talcum powder...and just roll with it.
They CAN, not that they will.
If you happen to miss some shots, changing shafts may help you adjust for deflection to make them.
If you can't draw a ball as much as you like, it may very well be your shaft. No matter what people say, shafts DO make a difference in the action you get on the cueball. I played with quite a few shafts that just felt horrible with cueball action. The cue in my avatar for example, I had to hit it a lot harder to get the same action from the cueball, and the guy that sold it told me the same thing he said "I got tired or working hard to get the same action from the cue".
Everything affects your pool game one way or another. Probably the butt of the cue is the least likely thing to affect how well someone plays, with maybe the exception of length that could make someone play better due to being able to execute the stroke properly.
Price or what product will make someone better is all variable. You can't just tell someone they will play better with a $500 cue vs a $100 one or that changing to this one shaft model will make they play better, but you can 100% of the time tell them that maybe something new they will try will make them play better, and it may be that $2,000 cue with some special taper and shaft build that just happens to match how the player shoots and has just the right feel for them.
That is what makes all those "expensive cues won't make you play better" and "It's the player not the equipment" ideas not really correct. The real statement should be "The cost or technology of the equipment is only part of the overall game and having something more expensive or newer tech is not a guarantee of a change for the better. But it may be."