Yes, but you’re selling it as stock music. Your goal is to make a track that is as versatile as possible within the confines of your target genre / style. I listened to the track and I have to agree with Leon. The timbres may be true to the real instrument but they just don’t fit here. The off-tune notes could potentially be off-putting to some buyers - and you don’t want that! 
I think his response was fine. A little harsh, but you did ask for feedback, right? I’d be grateful for everyone’s advice instead of trying to fight back…