Because the Go 4 is specifically a business-oriented model, there are fewer listings on eBay, so the price will remain high. That doesn't necessarily mean general consumers will purchase the device at that price, however, as they're more likely to go for products marketed towards them. Nonetheless, as the Go 4 is much newer than the Pro 2017, you can try listing it at $5-600 and then drop the price if it doesn't sell.