I don't know about that. I mean, addicts are addicts, and regular people do shit like this all the time. I mean, it's not like Joe Cokehead on Cops was thinking "Well, I really shouldn't be driving... but I can't afford a limo, so I guess I'll have to risk it." Drugs make you do stupid shit no matter who you are.
If Lohan weren't famous, she'd probably just be the normal, typical, "She'll fuck anyone to get her fix..." woman.
Fame doesn't matter... some people just don't tick right.