to those who say "why go cheap on something that doesn't matter?"
First of all, what is the largest part of the motorcycle?
Race bodywork is not there at all to "keep you from wasting your OEM bodywork" or "made to wreck". The real purpose of putting race bodywork on a real race motorcycle was designed and is still used as a performance advantage. The race bodywork on any well funded or most professional race programs usually cost a lot more than the OEM stuff. They are on there because of the weight savings, aerodynamic and profile changes (sbk seats, taller windscreens, larger ram air ect.) and ease of taking apart for bike adjustments/maintainance/repairs at the track or durring a pit. I'm sure most all of the factory teams would like it a hell of a lot better if every they wrecked, they were wrecking a set of OEM bodywork + lights instead a $3k set of carbon fiber...
Have you ever held up a set of new optimal or e-racing bodywork next to a set of Sharkskinz? They weight easily 3 times the amount, maybe more than that. You're talking about up to 10 - 15 extra lbs. of top-end weight on the bike.
Secondly, plenty of times when a bike goes down at any speed, the bodywork can get broken up badly enough that it leaves the bike un-rideable. Imagine that happens early on the first day of a track weekend that you drove 6 or 8 hours to get to, and now you can't ride the rest of the weekend. Sure you can buy another set cheap when you get home, but its a hell of a lot better to be able to just pick the bike up and ride again. I literally have a set of Sharkskinz in my shop that has been down 3 times this year, all at high-speed, and once at 100mph+. After all 3 of those get-offs, the rider still was able to finish his race weekend with that same set of Sharkskinz on. With that being said, it was still in good enough shape that I was able to fix all of the cracks, and get the nice original paint job basically back to perfect again pretty cheap.
Sharkskinz is not indestructable, but it is by far the best crashing bodywork I have seen on the market, and will by far pay you back. Every week I get sets of crashed up bodywork from one brand or the other in at the shop to fix, trust me I can easily tell the difference.
Nice bodywork makes a difference in your track experience with your bike. Armour Bodies, Attack, and Sharkskinz are definitely 3 of the top 5 brands that I know of in the US + Europe, and probably the top 3 of mainstream brands.
How many times do you take a bike apart at the track to make an adjustment or fix something? I can have my bike with Sharkskinz apart with upper, lower, and sbk tail off the bike in about 1 minute easily, and back on the bike ready to ride in about that time as well, by myself.
Also, if you have any kind of nice paint, wraps, or any kind of sponsorship to show off or cause to promote, if the bodywork is wrecked you lose all time and $ you put into the paint or gaphics. In that case, 2 sets of $400 bodywork that get destroyed after 2 crashes can't compare with 1 set of $800 set of bodywork that survives all of those and can't be re-touched for cheap...
That being said, I'd rather ride ride with cardboard than not ride at all. If you can afford it, the higher-end brands are well worth it.