I do the same thing, but instead of spending my money I use junk mail that includes return envelopes (e.g. credit card offers, etc). Discover Card must have box

I do the same thing, but instead of spending my money I use junk mail that includes return envelopes (e.g. credit card offers, etc). Discover Card must have boxes of junk mail from me by now, I hope they like paying for its transit.