Why do you think budgeting is an issue specifically for frum families any more than any other community?
I'm not convinced the frum are any worse at budgeting, but I would argue they need to be better than average given the lifestyle.
Also I constantly hear people berating "other cultures" (read: specific racial minorities) for being lazy and taking government handouts while simultaneously justifying their own food stamps, WIC, and other assistance as being due to their large families and perfectly acceptable because they meet the criteria. Did you know you probably don't really meet the criteria if you're hiding income by getting paid half on a W-2 and half on a 1099? Most still eat out, buy national brands (sodas, cereal, etc) at more expensive frum supermarkets instead of cheaper national chains, etc.
All that being said, most people don't fit the description above. But unfortunately a lot do, and whenever I notice it in my neighbors or peers it really annoys me.