My hubs have always recieved a good array of comments. I attribute this to the large amount of followers and friends I have made here on hubpages.
If you want more comments, you must visit more hubs and always leave comments.of your own. This is the number one rule. Also get active in the forums and be sure to share your hubs as well as others on FB, Twitter, Pinterest and such. Follow these suggestions and the comments will come, providing your hubs are helpful and written with good, quality content.