I believe they have a financial incentive to not do this. If buying a second-hand switch is perceived as risky, then sales of new switches will be encouraged.

I believe they have a financial incentive to not do this. If buying a second-hand switch is perceived as risky, then sales of new switches will be encouraged. Of course this would cause a switch to depreciate even more when you buy it since it would suppress the market price of a used switch. But I'd wager most people aren't considering how much they could get from selling their switch when they're considering buying one.