The Z4 is built much better (stiffer) than the Z3, so the jump in price is justified. The M is about $8k more than the 3.0si. This is the premium you would expect to pay for any M Car. There is nothing odd about their pricing.
Mind you ... roadsters are not for everyone. I personally would rather drive a roadster than a coupe or a coupe convertible, but I think I am a minority in that respect. Roadster fanatics (who don't want to drive a coupe) know that they will pay coupe prices even though they don't get the back seat. However, we get a fully automatic convertible top and a lighter weight to make up for it ... and in this case we also got the CSL brakes.
2006 BMW ///M Roadster
- Premium/Nav - Triple Black (Mine)
2004 BMW 530i
[E60] - Sport/Premium/Naviation (w/slushbox
) SilverGrey/Black (Wife's)
1990 BMW 525i
[E34] - (Daughter's)
PREVIOUSLY - 2003 BMW Z4 3.0i
"Happiness is a garage full of bimmers!" (and a couple of go-karts)