Auditioning headphones (ethically)?

@northman, 
The Cable Company has a Headphone Lending Library, you can borrow multiple models. I’m not affiliated with them but have made purchases.
https://www.thecableco.com/the-cable-company-headphone-lending-library
Good luck, enjoy your quest.

Like russ69, I've worked my way up Grado's line of headphones from the entry level SR-60s up to the SR-325e's and they do improve as you climb the food chain. Not everybody likes open backed headphones but they allow me to hear ringing phones, doorbells etc when necessary.

@bslon, thank you so much. I read in another headphones thread here that the Cable Company had a good policy but I couldn't find it on their website. That's great. I have an account with them and will most likely try that.

@orgillian, thank you. I've had Grados for at least twenty years, the SR-60, SR-80, and now the RS2E. They're incredibly comfortable and I love the Grado sound. Long story short, I want to branch out. 

Not sure where the ethical concern comes in, if you're abiding by the return policies. The Music Room literally expects people to try and return things, so I'd think that other companies must expect the same, or at least they should if they want to stay in business.

Why not start buy buying a couple of headphones from TMR: https://tmraudio.com/personal-audio/headphones-over-ear/

"Every product we sell has undergone a rigorous testing protocol and is backed by our 14day satisfaction-guaranteed return policy (when purchased at www.tmraudio.com), along with a 45-day warranty. In short, we want to make sure you are 100% satisfied with your purchase."

Ethics were part of your question, yet most responses seem to ignore that aspect.  From the standpoint of a dealer selling headphones, the only real ethical point is that if you use a dealer's time, demo inventory, home trial policies, etc., you owe it to the dealer to make your purchase from them if you settle on something they made available to you.  In a case where several dealers have the same offering and each made their best effort to facilitate your decision, you have to choose to buy from one.  A "good customer" will thank the losing dealer for their help, and acknowledge they bought elsewhere and why.  If price becomes a factor, always allow the most courteous and professional dealer the option to counteroffer or match, and be prepared to ethically decide if their service has monetary value, because if it doesn't, you are not a "good customer"!