>>99266303For one, you, usually, get a lot more story in a volume of manga than in a standard comic book, because it's far longer, thus having more content. So, it's a more enticing read than cliff-hanger after cliff-hanger, read off in monthly 20-30 page books.
The price is also another factor. It's been ages since I've bought Manga, but if I'm not mistaken, it'd range from $9-$12, depending on the publisher, brand, size of the manga, and etc. So, let's say, 150 pages for $10. That's a 7¢ a page.
A 25 page comic, probably going to cost around $2.99 to $3.99 from one of the big 2, depending on the series. So, let's say 25 pages for $3.50, which would come out to 14¢ a page. Double the price per page. Granted, these comics usually are also in color, but that's still a large price jump, and for less content.
Then, you have to get in the semantics of Manga VS Comics; how usually, a Manga will either be a solo effort on the production side, or small teams, and that they generally have control, outside of their publishers and editors side-arming some of them. They're also generally self contained stories.
Comics on the other hand are team efforts, with multiple members working on each issue, and you can't ever be sure if the same team will stay throughout a whole story arc. As well, cross-overs, tie-ins, and each time is supposed to work with the studio as a whole so nothing undermines the universe being built. It's a lot more working parts.
It's almost like homegrown vs store bought, in a way. They both have the ability of being good, it just depends on the process of how the product is grown and then how the product is prepared on top of it. It can be good or bad, but it'll vary depending on the taste of the consumer. But, because of standards the big 2 have set of their businesses, certain practices cause the food to be grown poorly as of late; not every batch is bad, but it's not as good as it once was either. Meanwhile, Manga is the same as always.