Well, "a bit expensive" in relation to what? A virtual private server costs $10/month for example, so it's an order of magnitude more expensive. My domain doesn

Well, "a bit expensive" in relation to what? A virtual private server costs $10/month for example, so it's an order of magnitude more expensive. My domain doesn't even get 10 hits per day but I pay for the service anyway and maybe someday I'll use it more thoroughly. If you needed thousands of domains you could get them for the same $15/year as subdomains, of course -- if you look up "tmp.drostie.org" the process is the same; you ask ICANN about "org", they say "PIR!"; you ask PIR about "drostie.org", they say "drostie's server"; you ask my server about "tmp.drostie.org", and it says "that's this server too!" -- I don't have to pay anyone else for that service.