I think these days being able to return an instrument is the only practical way of even trying the majority of available instruments out there. I'd much rather be able to reliably go to a local music store to try in-person, but that's no longer the case. As to the costs incurred, it's super expensive to pay two-way shipping so I'd argue there's plenty of dis-incentive to go crazy with it. Plus the sellers can and do set up return policies to limit the damage to their satisfaction. When I made the change to 5-string, I bought and sold a few as well as a return or two over the course of a year before finding the one. I did feel bad during the process, and was consciously worried that I was seeking perfection to a fault. But in the end, I'm the one who paid most dearly for it with the time and shipping costs, and I did manage to find one I was happy with, so for me it was all worth it and nothing to beat myself up about. I think if you are a retailer benefitting from the internet market and being spared the costs of brick & mortar, then absorbing some degree of handling costs is just the reality of doing business. Glad that's over though!