點解樂器會咁貴??

They are expensive because nowadays, schools requires students to learn at least one musical intruments.

If you really want to learn an instrument, I recommend you to learn Chinese instruments. I myself lean one too.

咩野樂器先？
只是樂器一詞，很空泛。
樂器有平有貴。
例如：豎琴、鋼琴、銅管、木管樂器、絃樂器、座地式電子琴就好貴，少則$2000起、貴則$1000000以上。
很便宜的樂器，如：口風琴、口琴、牧童笛，數百元以上就有交易。

It is because some musicinstrument is from the other country.
E.g.Korea