How would you ever expect people to be able to type your domain name in their browser? I don't think the average user knows where/how to find their alt-codes...

www.©.com is for sale on
eBay for a starting bid of only $500,000.

www.®.com is for sale on
eBay for a starting bid of only $250,000

Anyone interested in buying www.š¢£¥₧ƒû᧿¿.com/?
It's still available

www.¥€€â€*.com should be a topper as well.

www.â„¢.com is taken already (resolves to www.tm.com... good thinking).