When I first starting riding about 5 years ago, I was 17 and didn't have any other friends/family that did it. I just learned from personal experience and what I could learn of sportbikes.net, cycleforums.com, and specialty sites like this one.
I was told to save a grand for gear, so I did it. I bought a nice alpinestar leather jacket on closeout for just under 300, a shoei tz1 on closeout for 300, a* gloves for about a hundred, and later some boots
I know have 2 shoei's now and am looking at trying out an Arai, but without paying 500+, hence while I still don't have one.
The first instant* I tried on a brand new cheaper brand KBJ [I think that's what they are called, you guys know which ones Im talking about], I knew my $$$ was well spent. It felt like garbage on my head, not nearly as supportive or comfortable and the size was correct for my head. I will not claim it's less safe, I have no idea.
Want to know why I respect Arai enough to consider buying one? They are the only company that puts a FACTORY helmet on their moto GP rider. The EXACT same helmet we can buy from their site for 600-700 or whatever.
Their philosophy is 'no one's head is more valuable than anothers'. I don't know if I believe the rhetoric as to why their helmets are so expensive, or if the price is even remotely justified, or why their company is such as jackass to their distributors, but if a MotoGP guy riding a 10 million dollar bike puts on the SAME helmet as me when he hits the track, that says something.
A year later, my shoei I purchased 5 years ago fits almost as tight as it was new. The fit in finish is excellent and I ride in all weather and do nothing to maintain it. My friend is picking up a new KBJ for about $120 because he says his is worn. Even if he bought a new one every year and a half, I'd still have him beat and would be wearing a 'better' helmet IMO.