Bostock famously quit Palace as a teen for Tottenham, but has failed to make the grade.
Zaha told the Daily Mail: "I see people criticising, when they are thinking like, '£20m? My a**e', but I never put a price tag on my head.
"I remember when people were saying Palace should sell me for £1m because I wouldn't do anything in the game - that was hard.
"The Premier League is where I want to go but I'm not saying I want to leave Palace right now.
"John Bostock left Palace when he was 16 and playing in the first team, but he left for the first club that came in for him - that's kind of stupid.
"Me, I've played over 100 games in the Championship. (Alex) Oxlade-Chamberlain went from League One to Arsenal and didn't play anywhere near that.