1 volume = $10 = 30min of reading
1 novel = $8-10 = 10+hours of reading
as an example 244 chapters of Naruto = 27 volumes and that was just Naruto's years as a kid, now there on to his teenage years and his adult life is supposed to come after that,or so I'm told.
the simple fact is that even though there are some really great manga out there and I mean on par with some high quality novels, it does not make sense economically to buy manga. that is why online sites, especially the ones that let you read for free, are so great.
when i say on par with some high quality novels i am not talking about Naruto on a scale of 1 to 10 naruto only rates about a 6.5 with me.