From my very limited experience, I think the Costco membership is well worth the price. A couple years ago my wife and I decided that we needed to upgrade our family room's TV. Once we settled on the features and size we wanted, I started shopping for brands and ended up an selecting LG model. From there, I started shopping for prices and found that Costco beat every other vendor with an average savings of around $175. Not being a member of Costco, I decided that spending the $60 fee was a good choice, and decided to join.
Rather than joining online, we decided to go to the nearest Costco store, which is about 3 miles away, to see what it was like since neither one of us had ever been in one before. When we got to the membership desk I saw that you could opt for an individual membership or a business membership for the same price so I chose the latter and put it in the name of one of my companies. When we concluded the transaction they gave me a welcome package with coupons for a package of 72 AA batteries, a giant package of paper towels, a similar package of toilet tissue, and two $10 gift cards. The total value of the welcome package was $72.
At the time, I was in the process of remodeling and enlarging my office at home and a couple days later I decided to get the same TV in a smaller size for the office. That model, at Costco, ended up being around $125 less than the competition. So, when considering the $300 savings on the two TVs, the $72 welcome package, and the $60 membership fee, I was ahead by $312. That's the kind of math that I like.