Cheaper than therapy and a lot of other things.
Plus it gets us out and about, so that's a win win.
Last week I traveled for the first time with only a handlebar bag and a 10 liter seatbag, and yes I didn't have much weight, but I really noticed an aero difference and maybe up to 5kph faster often than comparing with two rear paniers sticking out the side, which I usually have for light rides.