The 9€ ticket was so cheap and so heavily subsidized I found it a bit surprising they bothered charging for it at all. It resulted in very crowded trains in the middle of a covid wave. I bought the tickets, but used them so little I probably just broke even relative to the usual price.

Not having a regular commute, I do not usually use 49€ worth of transit in a month. I'd rather ride my bike than be in a crowded train any time that's a viable option. Still, I'd buy the ticket just to always have the option at 9€. At 49€, I'll only buy one if I know I'm going to use it.