Trick? Who says he’ll live long enough to reap the rewards? The god especially noted that 1 year is only 4K. But obviously as plot armoury as this story is, he’ll live.
Kind of a running gag these days. This T/L group really does just translate the worst kind of trash.
Why wouldn't he live long enough? A chessboard has 64 squares, if rice grains are doubled every square, by the 68th square, there'll be 446
quadrillion grains accumulated on the board, about 2000 times the annual rice production in the world. So if he manages to live to the ripe age of 79,
that is the amount of experience he'll have from the gift alone. And
loong before that, he'll already be the strongest entity in existence.
A LOT better deal than a piddly million exp. a month, don'tcha think?...