The dollar can be used once a day. It has to be a dollar’s worth of a product, service or use of a product. For example, A dollar’s worth of a $100 TV would be the life of the TV divided by 100. You would get to enjoy the TV for that amount of time. The product or service is instant and doesn’t require any preparation. It just appears and disappears. Or you could have a TV permanently that is worth one dollar.
I’m pretty sure I can find $1 worth of something I’d like, but I cannot right now, so probably if possible just letting that $1 go towards development of something like SuperTuxKart or Shattered Pixel Dungeon each day. Not much, but better than nothing.