A bit off topic but, if I were to scrape such data except without intention of selling it, instead using it myself... How fast are stock markets? Surely, I would know that the price of stock will increase in the next few days too and buying that stock after 1 hour, say, news hit a major news site, that would still profit me? If not, why? I mean surely you can find someone selling that said stock at all times, no ?

edit: replaced mysql with myself