Hmm,in my opinion that should be electronics and gadgets because we can often see some deals online and also clothes I think is a big one.That should be the top selling products as far as I'm concerned.
Well i think people buy digital goods more than physical things with their bitcoins because mostly digital goods are easier to be bought with bitcoins while for physical goods we wont be able to find a lot of places for buying them.
Yeah thats right, Its better to sell digital goods than physical, physical needs more effort to sell it online . In digital goods you can sell fast or instant trade, But in physical if you are a buyer you need to wait for a couple of days because of the shipping days.