What to do after buying CTX?

Don't get hung up on the investment angle of a modern motorcycle. There are easier ways to make money. Thrash it from day one and then look back later on what a great time you had with that bike. Money won't buy those great times. I've had my same old Velocette Thruxton for over 40 years and I'm now restoring it, but only mechanically. Stone chips and paint worn away to the bare metal will stay. Rust not a problem as the **** thing leaked like a sieve, but I love that bike to death. I'd wipe it down with a kerosene (paraffin?) soaked rag and it would glisten like new. Only thing I was particular about was the tank with its beautiful gold pin-strip. It was (is) sacrilege to touch that tank. I stand by my running in method, but not suggesting you do the same. To each his own, but you either get a "quick" bike or a slug. My opinion only, so ask your trusted mechanic friend for his advice, or look up “Break in Secrets” I’ll be harsh with my CTX-D when it arrives even though it will probably be my last bike, but I expect to hand it down to my son in good running order.
Back to the pristine angle. If you had the original 1968 Honda 750 in pristine condition, it would now be worth heaps, but do you want to wait that long?

Just to echo the sentiment, you can keep it looking good for a long time by spending time regularly cleaning and polishing using non-abrasive products. Make sure the rag you use is soft like terry cloth or all cotton. I use an off-brand pledge for everything except for greasy areas, the dash, grips and seats and glass. I don't know if Pledge is a recommended item, but it seems to do very well for helping keep everything shiny and helps keep dirt from sticking even on my helmet, face shield and windshield. It is especially important to wipe it down, even on the underside after riding in the rain or on wet roads, but if you plan on using it regularly, it won't stay in mint condition very long, but just like with a car, a little regular attention goes a long way. I've got an eight year old VW Jetta TDI. When people see it they think it's just a year old or so, but, of course, it's not mint condition, because I've put 130K on it.

Another thing I've found helpful is...If it's possible, store it under cover of some type at home and at your regular destination. I ride almost exclusively to and from work. I park under a dedicated soft shed at home and in a garage at work where I found a little extra room shared with a work vehicle. This is also good, because I can hang my gear up near the bike and not have to worry about storing the gear or leaving it out in the weather. If I leave work, and it happens to be raining or very cold, I can suit up while still under cover and not have to expose myself and the bike till I'm riding back home.