Welfare queens are basically a myth. It's pretty much impossible to get rich while on welfare, and the presence of a few luxuries doesn't mean they earned those on the government dime. I'd suspect many were purchased before the family had to go on food stamps, and well, selling your vehicle to trade down isn't really practical if the vehicle is paid off.
As someone who grew up poor, I find it pretty insulting that the conservatives seem to demand that anyone poor 'act poor' by not having anything nice, to fit their stereotypes of what the poor are. Incomes can change pretty rapidly in this country, and folks aren't going to sell everything that they own or find comfort in just to fit image. Do you get rid of some things? Yes, if you are looking at a lengthy time without work or such. But you don't get rid of everything.