You're good since the i8 is not a supercar
I think most people that are ordering an i8 just want an i8 for what it is and aren't really cross-shopping it with other cars. I also think that it is not "the only" car for those people who are ordering one. Likely they have one, or several, more car(s) already in their stable.
What cars would someone cross-shop against the i8 if only one car was an option? Would it be on price, on performance, on efficiency? I can think of a bunch of cars and all are as different from each other as they are from the i8.