Put yourself in the mindset of the capitalist who is your CC company.
They want to make money on the card. Inactive cards = no profit.
If you show zero usage over an extended period, they see no profit in you, and may slash your CL, or even close the card.
It costs them admin $$ to keep your account open.
I would make at least one charge every month or two, forcing a regualr billing statement with balance from them, and then just PIF before the statement due date.
No interest due, and activity is then shown on the account.
I speculate that their account review software looks for accounts with no balance and no billing activity, say, for around three months, and then flags that account as a no-profit account.
My lower CL and lower balance CCs dont bombard me with balance transfer offers, convenience check offers, etc., nearly as frequently as my higher CL and higher % util cards do. They monitor your usage, and seek out those that keep % util low, and thus wth low repayment risk, but also those who use it frequently, and are thus most likely to acccrue monthly interest by making less than a full PIF each month, while also not having a high % util that demonstrates a potential repayment risk.
Use it or lose it.
