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Part of the reason may be the extra attention on-line courses need in terms of "quality". (ie readability and such) as there is no direct feedback.
Also on-line courses are perfect for employers to enable employees to develop while employed (daytime courses are way too demanding on work-schedule). Businesses have a lot of money, therefore they can be charged more...
(just like flying business class, you pay triple the economy-price but you don't get there any faster)
I don't know if it is applicable here but market differentiation(?) always comes to mind in these situations.
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