The same could be said about cues, why spend a thousand when one for a hundred can do the same thing, personal preference.
Personally I am more convinced by arguments for spending more money on a cue than I am by arguments which advocate bank-breakingly priced chalk, although again I'd love to see a double-blind test where a pair of cue manufactures each produced a de-branded cue (one which retails for 200 dollars and one which retails for 2000 dollars) and let a group of pros play with them for a few months in a huge tournament.