Possibly the same reason you would not say "I lamps and clocks want.". Because it is unnatural. Hungarian is a different language with different rules.

Be careful with the accents though, "akarók" is not the same as "akarok".
"akarok" - I want
"akarók" - (the people who are) wanting

If you say "Én akarok lámpákat és órákat", it means "I am the person who wants lamps and watches."