You can sell anything you want but that tuner is branded to your VIN. It's junk to someone else. Nothing runs better than a tuned bike. No canned Map on this planet is going to run better than a DYNO TUNED bike PERIOD!
Your not going to gain anything going to a powervision but a lighter wallet.
The only genuine advantage to the tuners with the canned and/or tunable maps, is that you can tinker with it yourself, and make the bike "runnable" to the best of your ability. The dyno-proven maps are adequate, but not exceptional.
If you're always swapping pipes, intakes, cams, etc., the programmable tuners are the way to go to keep things running, and not go broke paying for dyno time.
Unless you sell your ECM with the SERT, it's useless. It's a "married couple" once activated.
Also worthy of note- I've paid for a dyno tune on my bike, swapped the exhaust, ECM and SERT to another bike, then taken it for dyno tune.
Essentially, that would equate to a "canned map". Same model bike, same year bike, same mods (intake and exhaust only). Same operator on the dyno even..... 9hp, and 12ft/lb. difference (less). The SERT was mapped on bike 1, bike 2 was apples-to-apples. Both had under 10k miles. After tune, I was within 4hp of bike 1, and torque was a spot-on match. That's as good as it got.
It never ends, and the cash usually can't keep up with the mods.
That being said- No 2 production motors are IDENTICAL in every aspect. Balance of components and precision assembly in mass produced machines is an expensive prospect. A quarter gram difference in the weight of a connecting rod, a piston ring out-of-spec, a head gasket bolt too tight on one corner.....
All of these things add up. With the advent of CNC machinery, the tolerances become tighter, and assembly becomes more critical.
This is particularly evident in many high end firearms. The "boutique" 1911's come to mind: Ed Brown, Nighthawk, Les Baer, and Wilson Combat and the like. I could never justify the cost of a $3k-$4k pistol. The break-in period for some is such, that you have to dump a couple hundred rounds down the pipe before it's a dependable sidearm. I'm OK with my old Kimber (not a cheap pistol). But it's as tight as it needs to be to function reliably. It'll obliterate a paper plate at 30 feet with a single magazine. It'll always shoot better than I do. And it was affordable.