I have not done super extensive research on the topic, but here's the lowdown on anime pricing in the US of the two companies in question (people who know more can correct me if you want).
But before that, let's look at the super fun anime prices in Japan. Kill la Kill is a nice example. Anime in Japan is spiffied up and usually includes fun extras like postcards or stickers from the show (and sometimes a mini art book or posters), but it's also sold by volumes (which is anywhere from 2-5 episodes each). This is volume 1 of Kill la Kill on Amazon Japan: http://www.amazon.co.jp/%E3%82%AD%E3%83 ... ll+la+kill
It includes 48 minutes of footage (about 2 episodes), but it has some goodies to go along with it (plus, it's Blu-ray), but for a simple yen conversion to dollars, you're looking at about $550 USD just for volume one.
Though Amazon is a good sport and can bundle volumes 1, 2, and 3 together for a little less than $2,000 USD (which is still about the first half of the series).
So when you're looking at that, it makes us pretty lucky to be able to buy anime by the boxset from Funimation for $50 a pop on average, right?
In regards to comparing Funimation to Aniplex USA, it comes down to licensing wars (well, not really wars, per say, more like competitive business). Licensing is a tricky business since everyone wants to make money one way or another. I only know a little of how this works, but I'll throw out a few assumptions on why Funi can charge lower prices, while Aniplex charges more for their anime.
Basically, Funimation is better at cutting deals, or rather, they have a longer business relationship and they can compromise. If there is a really popular series that they want to license (like, say, Attack on Titan), they will try to grab it up as soon as they can and they more often than not grab the TV aired version which is cheaper (not the Blu ray release, which can be slightly different). But what may end up happening is that the Japanese company will offer it to them at a lower price IF they license a few not as popular series along with it (this is why I'm face palming at some of the recent choices that Funi has been putting out lately XD).
Funimation has also been around a bit longer than Aniplex USA, so they have popularity and are well known enough to sell enough and thus be able to lower their prices.
Now, Aniplex I don't know as much about, but considering they only are releasing popular/"good" stuff, I would assume they skip out on the lower price deal and just pick and choose what series they want (and unlike Funi, they will usually try to get the Blu ray quality release if I'm not mistaken). And in order to not lose money, they charge more for their boxsets.
It's all business. They don't really care about you and your ideas of how cheap anime should be because it freaking costs up to $300 for one or two episodes sometimes (or for movies, oh my gosh). $80 starts to look cheap.
Plus Aniplex releases some of the extra goodies with the Blu ray and DVD sets like they do in Japan, hence the higher price.
Funimation appeals to the "I just want my anime and no extras" market, while Aniplex USA is catering to the crowd that would love to buy the original Japanese DVDs, but the import fees and the prices would kill them (though some people do still import anime from Japan!), so all things considered, Aniplex offers a pretty fair and good price for their stuff.
Also, Aniplex usually gets the shorter series (12-26 episodes), while Funi makes most of its profit on longer series that are 50+ episodes, or epics like Fairy Tale and One Piece.
I have hope that Aniplex will find a way to lower their prices and still make money, but if people will buy it at that price, they'll keep it that way. They compensate their high prices by getting popular series and better quality.
EDIT: Oh, I guess to actually answer the thread's question, I am pretty okay with Aniplex USA because they picked up Gurren Lagann after it got dropped when Bandai went under. I look forward to seeing their release of the series. : D