Ouch that's steep. I bought mattb.net in 1995 based on a hunch this internet thing just might catch on. I think it was about $30 IIRC. Even at that time mattb.com was taken, much to my chagrin.
But if it's worth it to you then it's worth it. I guess I'd say just do it if you have the cash handy and it won't put a strain on your finances.
I'm terrified I'll forget to renew and lose it one day but so far, so good. I have auto-renewal set up but it would still really bother me if something failed and I lost it.
If you want to discuss it with me further, I have a nice easy to remember email,
matt@mattb.net.