Mint has an auto-upgrade tool so you don't have to reinstall each time. It used to be only for minor version upgrades but now you can auto-upgrade to a new major version as well. In any case there are plenty of great distros to choose from.
And yes! whatever distro (and other FLOSS software) you use, support them with a donation if you can! When you consider the value you are getting for free vs. what you'd be spending on proprietary software, it's not so hard to do and feels good too.