my guess is scale. mister car wash is publicly traded with 400+ units as the largest express operator in the nation. big operators and PE funds care about absolute dollars and a well run express can do $2-3mm revenues and $1mm cash flow with the right equipment and mgmt team so once u get a model that is low on labor, it's an easier business to scale with the right access to capital and managers without having to be at the mercy of each new market's labor situation. i'm a novice to the space but how many SS/IBAs do $1mm+ of cash flow? so with big financial and strategic buyers for express given its ability to scale, that's my best guessFrom a purely financial perspective (cash flow) why should Express Washes sell for 10x and a high performing SS/IBA sell for 5x when both might have the same (or close) operating income without the numerous employee headaches?