Answer: Yes, they cost money or some equivalent form of payment agreed upon by the parties importing and exporting. Imports by definition are goods that a country pays for to bring in from a foreign country.
WIMAX is a technology like gsm, wifi, etc. The technology itself costs money (ref. A large reseller of WIMAX technology www.winncom.com in North America) now the use of WIMAX and the associated costs is purely up to the network operator of the WIMAX network, just like any other deployed technology the monetization of its facilities vary vastly.
Answer: It depends on a variety of factors, your age, level of education, marital status, insurance provider, level of coverage, and type and value of the vehicle. Younger people tend to pay roughly 1000 dollars a year for it.
Answer: Because gold is very rare and is limited on earth. Also because gold acts as a kind of security, so that if one day a countries currency becomes unstable, you can use gold to exchange for more stable currency. Therefore gold will always be valuable.