I used to play a game called runescape and there was this client called OS Buddy that had data dump of all 'buy' and 'sell' orders in the grand exchange.

put the data in python and I calculated the "flip" ratio, average and liquidity of the items.

Now that was all profitable, but around this time there was a phase where everyone discovered that you could do pump and dumps and make obscene profits. They worked exactly how normal pump and dumps work, a select few insiders buy a bunch of the random item and then after a few days they annouce it to the clan and start selling their item. I could see a surge in abnormal buys for items with low liqidity and effectively have a birds eye view of all the pump and dumps before they aree 'Public".

I never had to have a job through high school as i could sell the GP and make around $50-60 a day!