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Engine longevity is of less concern to me than daily performance. I purchase Shell 91 octane (or occasionally Chevron w/Techron), in part because of the superior cleaning additives. These cleaning agents, as I understand it, cannot get to the "dirty" side of the engine. In fact, GM has "upper induction cleaning" as part of its routine maintenance schedule, specifically to address carbon buildup.
I installed an APEX catch can in both my wife's 2013 2SS and my 2014 ZL1. The bottom of each can has oil every weekend (both are daily drivers). I have since backed off to checking every few weeks (just seemed to OCD to do it every weekend (lol)). In my opinion, it is better for me to dump that oil rather than allow it to collect somewhere else in our engines.
The cost, again in my opinion, is a minimal one time expense. What I hope to gain between top rated detergent gasolines and our catch cans is continued top performance from our cars on a daily basis.
Marcus
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