Shares have risk/reward so not the same thing.
so does buying something and trying to sell it on, whether its a bike, or bulk batch of brake oil, or many other things. Capitalism innit, we can argue one is worse than the other but it’s all shades of grey.
Having said that, whacking up the price of sanitiser and PPE is the extreme end of the spectrum, but Ive no doubt there’s huge corporations figuring they can make better profits from their ppe kit, not just corners shops selling alcogel for a £5 a go. The further removed you are from the sale, the less ill feeling you get your way, but its the same system.