Is Costco executive membership well its worth?

We were on Costco Regular membership paying $50 per year and just few months back, decided to upgrade to Executive membership by paying an additional $50 (Executive membership cost $100). I was reluctant at first since I know we don't spend a lot at Costco. We usually just get fruits and basic groceries. At 2% cash back, I don't think we can break even. However, the customer service at Costco membership counter highlighted the benefits and worth of Executive membership. As Executive members, we will receive more Costco member-only coupons throughout the year and enjoy better savings. Of course, if we don’t "profit" with the Executive Membership, Costco will give us back the difference - the additional amount you paid for, to upgrade. For example, our case- we paid $50 extra to upgrade, if we only earn $20 in rebates (based on 2% cash back) at the end of the membership year, Costco will pay us back $30 to make up to $50 - we just have to bring our rewards check back to Costco at the end of the year and do this "claim". Ok, I need to verify this at the end of the year. Also, hoobie kept saying we should go ahead with the upgrade since at any time we are not satisfied and want the refund of membership fee, we could just cancel the membership. There should be no questions asked too. I'm still feeling fishy about the upgrade till today but since we have already done the upgrade, let's verify all these $ issues, when the time comes. Hmmm...did we make the smart choice?