Earnings decline after initial high-reward period as games move to maintenance rewards. You can do the same with very low bids, at the risk of earning sandbags for your trouble.
https://www.ww2.site/forum/viewtopic.php?t=69131
http://zl37.com/forum.php?mod=viewthread&tid=3060&extra=
http://www.horsecity.ru/phpBB3/viewtopic.php?f=10&t=188897
http://horsecity.ru/phpBB3/viewtopic.php?f=8&t=275970
http://forum.bandingklub.cz/viewtopic.php?f=43&t=1133199
http://horsecity.ru/phpBB3/viewtopic.php?f=22&t=269410
https://shop.oawxw.net/forum.php?mod=viewthread&tid=1952216&extra=
https://debate.socialism.nl/forum/showthread.php?tid=200194
https://debate.socialism.nl/forum/showthread.php?tid=141641
https://ufr-2020.front5.picapo.net/forums/viewtopic.php?pid=442472