I agree with the above responses - anything that will lend consistency to one's game is, I believe, an asset. Although certain conditions change all the time and one must be able to adapt to them (the cloth, the balls, the humidity, the type of table, etc. as pointed out above), using the same cue eliminates the problem of adding one more variable, which can make adapting tougher (i.e., did the English "grab" because of the softer tip on this cue or because of the dirty cloth?).
