Well that's the idea - you pay someone $50 (or however much you want) to take something off your hands that you're keen to get rid of, like someone paid $5 to get rid of this Performa. If you offer something for free then people might not bother with the hassle of coming to get it and carry it home etc, but if you offer them some cash as an incentive, as well as the item, they are more likely to make the effort! In some places it costs money to dump such things, so you'd rather pay your "bidder" to take it away and put it to good use, rather than pay the local authority to do it and trash it.