I wouldn't say that I feel obligated
(unless, obviously, I got something from EF to review!), but I enjoy writing reviews, sharing my experiences and letting other people what worked for me and what didn't. I'm lucky to have a LOT of experience with a LOT of different toys, products, lubes, etc... and I feel like I have something to share with the community by writing.
I usually don't let it stop me if something has already been reviewed - I think the great thing about EF is that you can get so many different perspectives on a thing. It really helps you know what you're buying