I'll bite:
Politicians, husbands, wives, bikers, fishermen, etc use excuses to justify the mods, improvising, accessories, gear, expenses, etc. that one desires.
The above excuse is one that works here in the USA. The women are known to use the "Look how much money I saved" when buying extra apparel on sale.
Who has used the "Scooters save so much gas" as an excuse to purchase one. But knowing full well, the cost of the scooter, faster tire replacement, accessories, etc would have bought enough gas to keep the cage going until it expired. Well, maybe not completely. The money I've spent(so far!!) on my Xciting 400i including accessories, purchase price, insurance, maintenance, etc would have powered my Optima 98,383 miles at the current price of fuel.
As stated above, no hard numbers except for my own personal data which will obviously be different than others here...some +, some -
Wanting more power?
I think it is just wanting more. As in more range, more torque, more miles between oil changes, more range on tires, more mpg, more, more, more.
Again, no facts. Just my thoughts until others reply influencing my current set of considered data