Your ebay selling is a great business! It is all about how you present it.

The Chase Ink Preferred business card gives you 80k ultimate rewards as the bonus. They can be redeemed for 1.25x value through the chase portal for air, hotel (disney included), cruises, rental cars. If you were to eventually open a Chase Sapphire Reserve they'd be worth 1.5x value.
Some people have to warm up to the idea of the business card...I did too...so if you don't want to start there, then that is totally fine!
In that case the Chase sapphire reserve or preferred would be great too. They also earn UR points.
Do you think you'd be interested in these types of cards? If so, I can elaborate.
I am going to disney next weekend...booked Coronado springs resort through chase for 26,000 points. You can get tickets and dining there too, but I opted to use discounted gift cards I had stashed away. I booked flights with southwest points (also transferred from chase). This is just an example, to help you see options for travel.