Why would you buy a $2-5k cue when a $130 cuetec is all you need?
Keep in mind, not all cues are made equal. Different woods cost different amounts. Plus, some cuemakers are better than others, making higher quality cues.
The same principles apply to nearly everything you can buy, including t-shirts.
A 'Fruit of the Loom' shirt will have a much different cost than an 'American Apparel' shirt. Different inks have different qualities. Like not fading as easy in the wash, different feel, etc. There are also different processes that cost different amounts. You can get a heat transfer shirt for far less then screen printing.
When you pick up a t-shirt.. and they feel the same, its the same as someone picking up a cuetec and a Black Boar and saying they are the same thing.