Hello. The maximum number of votes you can get in a month with 30 days is 120 votes, if you vote consistently twice a day for both sites.
72 votes is 60% of that number. That means you can get the monthly vote reward in 18 days if you vote consistently, which is just over half a month. You can also vote just once a day (on both sites) for the entire month to reach 60 votes, then you would only need to vote a second time for 6 of those days to get the reward.
In the past, the number has been changed if: The month has less days (February has 28 days), either or both of the voting sites have persistent issues which prevent users from voting (March).
I don't see the issue in rewarding avid voters. Monthly rewards are a thank you for your dedication. Furthermore, there are lots of other voting rewards you can obtain, which roll over each month, so there is still a strong incentive to vote, regardless of the vote item. Luckily, people are often willing to sell or trade their vote items, so there are still plenty of opportunities for anyone to get the item.