Thanks Willi.
So basically a group of 20 people put in roughly $450 at current btc usd price in hoping to hit a block. So how long does the hash rental last? One month?
43000 x 6.25 = 268,750
20 x 900 = 9000
268,750/9000 = 29.86 to 1 for your money. Depending on rental price the real odds could be 27 or 29 to 31 or 35 to 1
Most often it is gambling as the odds you get are likely to be a bit worse than what you should get.
Gambling is betting at unfavorable odds
Investing is betting at favorable odds.