ScottBailey It’s pure $$$, there are no instances of colour clash really where a third kit may be required.
I remember Liverpool introducing a yellow one season because their red (home) and white (away) both clashed with Sunderland’s red and white stripes. But technically* the referee can force the home team to change kits too until a clash is resolved.
*as far as I have been told by a semi-pro referee, I can’t actually be arsed looking this up in the laws of the game
