Which car washes are we talking about? Self service manual washes, or something more akin to a light detail that includes a hand wash?
In the US, you can drive up and pay $1~/min and spray your car yourself w/ soap and water. You can also do the drive-thru option for about $10. On the upper end, you can pay $50~ for what might start as a drive-thru, but then someone comes out and does a manual touch up where the machine might have missed a spot, and then they will vacuum and wipe down the interior.
At $100+, you're looking at a hand wash and detail, potentially going up to hundreds of dollars for different aftercare options. Detailing can be very lucrative if you get a good referral network established.