What I don't get is why is there, say, "$50,000" instead of "$37,501 - $75,000" range? If it is the same, why don't we use the scheme for monthly betting we've been accustomed to?
It may be that some one requested that specific amount quite a while ago. For the end of November the spreads go up to "more than $25,000" which is very self explanatory (and paying out 48:1)
In any event $25k-$50k spread means the price would have to go above $ 37,
500.01 (not one dollar) for it to be closer to $50,000 than be closer to $25,000. it'd then have to leap above $75,000.01 for it to be closer to $100,000 than $50,000.