buying bitcoins from ebay I am brand new to bitcoin and I only know the very basics of it. I have a few questions:


As the title says I am looking in ebay to buy bitcoins and there are some sellers are selling 5 bitcoins at opening of auctions for only 1 USD is it a scam I mean at the current exchange rate from my understanding 1 coin alone is valued at 900 USD which is a total value of 4500 USD is this a scam or is this legit I only ask this since should I place a bet and win for only like 10 USD the seller must be mad to take a massive loss like that
if it isn't a scam how does the seller deposit his coins into mine do I send him my wallet address 
if I have to send him my address can he hack my wallet using my address or worse send my address to other hackers 


Sorry to seem like such a noob but I had just learned about bitcoin recently and like I said previously I don't know much about it basically any information I found from bitcoins's website summarizes m=the extent of my knowledge on bitcoins
Do not use Ebay to buy Bitcoins, it is against their terms and conditions are may cause problems for both you and the seller.