The only thing you have listed is a dining suite that you'd obviously only accept cash on pick up for anyway.
Re wanting you to email outside of ebay-that is stupid as messages sent via ebay should go to the members email address anyway.
JMO but you could block them if you think they're hinky-I probably would.
Oh & re getting your email address,well,probably lots they could do with it if they were slimey but they may be just plain weird LOL