When it comes to heat, the helmet thing is part of a bigger picture: core temperature of a rider and its effect on performance. Or in case of a recreational rider, heat stroke or just plain discomfort.
If its aerodynamics, the bigger picture is how you ride in that particular type event. TT bikes are set up different than Tri bikes in the Ironman. So maybe get two helmets: one for non racing events and the other for racing or pretend racing.
When it comes to style: then by all means spend as much as you can afford. Just don't try to justify it to anyone but yourself.
When it comes to safety: quit riding altogether.
How's that for "assertions"?
Last edited by Garfield Cat; 08-05-15 at 06:01 AM.