Akademik

За спрос денег не берут
You do not risk anything when asking a question, but you get a chance to learn what you need. See Запрос в карман не лезет (3), Спрос не беда (C)
Var.: За спрос не бьют в нос Cf: It costs nothing to ask (Am.). It never hurts to ask (Am.). Lose nothing for asking (Am., Br.). Nothing is lost for asking (Br.). There is no harm in asking (Am.)

Русско-английский словарь пословиц и поговорок. . 2013.