I personally have none but honestly to put it nicely as possible I don't think it is any of your's or anyone else's for that matter how much people spend on theirs at any given time. This is too much of a personal question to be asking.
I will also add that I made a private poll a month or two back wondering how people paid for their items on here whether it was with points,credit/debit card or a combination of both. I received an email from the moderator that it was too personal of a question to be asking an that it was removed. I was told it was rude and like asking people how much money was in their bank accounts.
I use it and pay it off right away just so i can build credit. Like if i spend 100 bucks on supermarket i use credit card instead of cash and pay when bill comes. I never purchase anything i cant afford with it thats how most people get into debit
lol.....um here's the thing, i did but i maxed it out within the first 2 weeks and i still owe on it, i then got another one from a store and maxed it out in one day and still owe on that as well..... i had $1000 limit on the first one and $100 on the second one. i would say go with whatever you think is managable for you at a time and do not under any circumstances do what i did.