I dont think you have to be into what you sell but you definitely have to believe in the product. I've got 15 years in the dvd biz (Mile High in Canada) and i gotta tell you i dont always sell stuff that turns me on... if i only sold what i like i'd probably be out of biz!hahaha
Sell what you know and you will prosper.
Luckily I know everything.
There's some sense to that Jimmi.
The best example is if feet turn you on, then promote them. Because you know what you like, the angles, the shoes... etc whatever. What turns you on, will likely work on the traffic and hence... conversions.
Hybrid Mode
