Why Wife and I are different people

So I've been browsing various forums cause I'm thinking of buying a 200 cc GT or a Vespa S and want to get a good deal on one used if I can find one.

And while I've been looking I've noticed that a lot of people are trying to dump 50 cc ET 2s and LX50s. If I tried I could probably find one for around 1500 bucks. Maybe less if I tried. Obviously I don't want one of these but I've got a spare 150 leader engine that I picked up cheap for a project and even though I'm not doing that project I kept the engine as a spare just in case. It's pretty complete, even has the rear wheel and wouldn't take a whole lot to just bolt it into a new frame.

So I'm thinking it might not be a bad idea to pick up one of these cheap 50 cc bikes and swap out the engine for my spare. I can sell the 50 cc engine to cover the costs of getting the local scooter shop to help me make sure the wiring is done right and maybe even pick up a few bucks on top of that. Then I sell the Fly 150 or the new
Frankenstein bike and make a few bucks on that deal and still have a 150 cc bike.

So I mention this bit of brilliance to Wife and her response is "You already have a 150 cc scooter. I don't see why you would want to do this."

And I realize if I have to explain she's just not going to understand.