I tend to be a pragmatic. I bought a 6500€, 47HP bike. Because i liked its overall look, feel and engine. It just happened to be a royal enfield.
For the money of getting that same bike up to 50HP (and getting it not street legal in the process), i would buy a triumph street twin in a heartbeat. It has more displacement, a 65HP engine, better suspensions, better finish.
Do not get me wrong, I like my interceptor, and it is totally worth its cost. I just find hard to justify spending that kind of money on an engine to get so little in return.
I have nothing against people doing it anyway. Not everyone cares about the money side when passions shows its head. I am doing the same with my race car (although with VERY different result. OEM power: 171HP. current: 600ish. And it revs higher than my int. Turbos are great
) And just like it, it IS a serious money pit !