Well, the reason I bought my reseller account (it's small, 1gig/10ig) is that I want to have all my sites in one place, at a low cost. This way I can also balance specs better. If one site neds 200 mb traffic pr month, I give it around that value. If it neds 8 GB, the same. If I were to buy end-user hosting, I'd be wasting resources with th first one and mayb lack them for the second.

That's the (main) reason