The punishment is so low that it makes no difference if you started playing a month before the end or not. Agreed, playing later in the season is usually more lucrative (but also not too late, as by the end everybody who has decent ranking stops playing, which is why decays are important/ok!).
Agreed that secondary accounts are a bigger/more annoying issue. Could easily attempt to tackle those checking the IP addresses (though obviously people who live together and also VPN is possible, so not obvious). The arena system is generally flawed, and I think (an ever so slight) decay will be a good thing, and not too severe as to actually make a major difference. Not playing for two weeks would lose you less than 10 points, that's nothing.
If you don't have time (for whatever reason) to devote a few minutes per month or few weeks, you probably won't care not winning an internet badge as whatever else is going on is much more important.
Agreed that secondary accounts are a bigger/more annoying issue. Could easily attempt to tackle those checking the IP addresses (though obviously people who live together and also VPN is possible, so not obvious). The arena system is generally flawed, and I think (an ever so slight) decay will be a good thing, and not too severe as to actually make a major difference. Not playing for two weeks would lose you less than 10 points, that's nothing.
If you don't have time (for whatever reason) to devote a few minutes per month or few weeks, you probably won't care not winning an internet badge as whatever else is going on is much more important.