I've been a Canon CPS member since 1982. To be honest, It's not what it use to be. As you may know, in the early years, there was no fee. You could only be accepted by submitting tearsheets of your work spanning several years. In it's current incarnation, it seems to be almost another revenue stream for Canon. Even though the price of Platinum was reduced about a year or so ago, there are not as many advantages. I sent in a 1Dx and the 50/1.2, 85/1.2 and 70-200/2.8 II for cleaning and checking. I thought there might be some back focus going on with the 50 so asked them to check the focus with all the lenses with the body. I was shocked to get a bill for $900! and that was "discounted".
Probably the best reason for CPS these days is the loaner program. You get to try out new bodies and lenses. But, they track your use. You get three tries on something. Or, if you already own something, you don't get to borrow an additional. I had a shoot recently for which I wanted a 2nd 1Dx. I tried to borrow it, and they said no, because I already owned a 1Dx. I ended up renting the 2nd body from Lensrentals.com.
Basically, the program is decent, but not what it was in the past. As long as it might provide you with something useful, re-join.
