So they already replied and said they buy wholesale or refurbish, but even if they were purely flipping that still provides some value. If they can buy low and

So they already replied and said they buy wholesale or refurbish, but even if they were purely flipping that still provides some value. If they can buy low and turn around to sell high, the obvious question becomes "why doesn't the original seller just sell at the higher price if that's what it goes for?" Either they are better at reaching customers who are willing to pay more (which provides value, that's a sale that wouldn't have happened if the customer doesn't know to look where it's cheaper) or the original seller just wants cash now and doesn't care about getting max price (in which case the reseller is being paid to supply liquidity and take on some risk of not being able to offload it or it goes down in price).