> Well, they provide value. They make it possible for people/entities who needs things the most to actually get them instead of those who happen to be first in line or in lucky position to get access to supply.

True - they also take on some risk of being stuck with inventory that they can't resell at a profit (if prices drop between when they buy and sell).

Ethically scalping feels wrong, but I think ethics aside, scalping does provide a service to the market.