Do some questions attract more spam ?

Spammers do that to anybody and everybody. Their only purpose for using Yahoo Answers is to get hits on a website or to promote it or to get someone to buy stuff. It doesn't matter what the question is. They're trying to attract costumers but we're not trying to attract spammers. Report it and then their posts will be deleted anyway. They'll end up with a suspension and then take their time to make another account.