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.
using ‘the pizza’ as the exchange rate, 243.9 coins to the dollar. iirc, it was a $41 pizza order for 10,000 coins. save up for the 41 days then use the ‘magic’ to buy that guy’s pizza.
at today’s exchange rate, 10k coins is nearly $968m. accounting for exchange fees and taxes (capital gains, since you bought them years ago), lets call it an even $750m.
now if the ‘magic’ lets you repeat that process every 41 days…