Well, as I understand the idea of Coloin Chapman he produced road cars in order to make Money to go racing - nothing wrong with that (by while doing this he went upmarket with the road cars no doubt, I believe) - These day manufacturers (in my eyes) mostly go racing in order to help to sell the road cars (esp the 5 door suv league diver should feel (...at least) like he drives a car from a "sports car"-Company .....Marketing bla bla) , so it is vice versa these days
@JayEmm many thanks fo all the work, just a short Addition to your comments on the seats / Ingress: I have seaten in a 400 and a 410, the Ingress of the 410 is much easier than entering a S1 Evora, so the difference 400 / 410 should really make no difference in reality (Minority, personal view: I like the wider sills of an Evora s1 more because they remind you you are entering a sports car and you have room for nice leather and metal skid plate - ok entering the car in tight parking spots is sometimes a c h a l l e n ge :-)
I believe that the difference betweeen 400 / 410 might shine more if someone would compare a 400 with a non optioned 410 without Sound insulation. As said before (and denied by @The Pits ;-) ) the whole concept of the 410 remind me a lot of the 911 clubsport from 1987 / 1988 (by the way: Golf GTI, some Seat high powered models can even be ordered today without airco in Germany, @The Pits)
If Money is no object it is very nice that Lotus gives you an alternative within the range. I believe this alternative is more attractive if you have use for a non-optioned 410; in this case I am with the short Statement by @Trevsked