I have a cheap performancebike jersey thats yellow, I rotate it with my jolt cola jersey and my orange jersey, cause I use it to go to work with.
It's not an imitation of lance, it's just good visibility.
OTOH, I was snickering to my gf today when some guy rode by in a replica yellow jersey, complete with logos and all. I mean, if you're a nice friendly guy, that's cool, everyone'll appreciate it. If you're an ass and likes to taunt and race people, then I suppose they'd find it a turn off.