I do suggest having Patreon Exclusives since people generally prefer the idea of exclusive content if they're about to pay for something, so that's likely to attract people to your patreon regardless of if you have a tip reward system or not.
That being said, if you have exclusive content that you don't have on patreon but sell through another platform (lulu, gumroad, or maybe amazon unless you're in the program that requires you to be amazon exclusive) then you can offer those with a calculated coin "price" equivalent as tip rewards.
You can of course offer content that is tip reward exclusive too but it can take a lot of work. Keep in mind when creating rewards that they should be easy to maintain in a proffessional manner!