Charging 50kWh per month pays for the £9.99 subscription. Ideally, you want to be charging significantly more than that to actually feel the savings. The gamble is whether it proves value for money given your current reluctance to go out often.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark