but your internet provider and the dub/distribution company are not the same entity...that's like saying that you payed for a plane ticket, therefore it's ok if you just take whatever food/magazines/other stuff you find in the shops in the terminal...it just doesn't work that way.
Just because you're giving money to one group does not mean that related groups get any of it.
Think of it this way, like your broadband internet...you are paying for a service.
The anime companies are finding anime, and bring it over to <insert country here> and (in most cases) redub the series into <insert language here> or at the very least provide professional translation, all for your enjoyment and convenience. You are also getting a product officially endorsed by the originator(s) which also carries with it an expectation of (some kind of) quality in packaging and content.
Buying the dvd is an expression of appreciation for the work that it takes to do all of that. It's been mentioned more than a few times in various places that when it comes down to it, we're getting a hell of a good deal on this stuff compared to what people in Japan have to pay.
$30 (or less) will get you up to 5 episodes over here$77 will get you 2, maybe 3 episodes over in JapanIf you don't think it's worth $5 an episode, Funimation lets you download and buy for $2 an episode. (yes, Bandai != Funimation, but if you're that picky then the $2/ep is an even better deal because I can't tell you the last time I saw Funi put 5 eps on a disk for $25)
One last thing before I'm done here.
Let's say you have the opportunity to download a fansub that's currently airing in Japan.
you get 1 ep per week (sometimes less), so 4 ep per month...There, you've already payed more to download the non-professional (read: no quality guarantee,) subtitle only, no extras included episodes than it would have cost you to wait and buy the official release ($53 for everything in your internet-related expenses. $159 for a 13 ep series)
/done