Because it's the hardest position to play, and they are the hardest ones to find. How many football fans claim their team is 'just a 20-goal a season striker short of being a great side'? 99% of football clubs on the planet are! Decent strikers are such an incredibly rare breed.
Agreed. But strikers are different sometimes. He's been struggling with the lack of service with no Mitoma / Andingra. If he was playing up front for Arsenal that wouldn't be an issue. I would wager he would have scored more goals for them this year than he has for us.