I'm very happy with my shelves full of omniboo and OHCs and Absolutes, etc. The presentation is, in my opinion, often superior to the original issues (nicer paper and all that, you get to see the comic that was created, not what was originally produced, a difference I acknowledge is not for everyone). It complements my actual comic comic collection very nicely, giving me easy access to a huge range of material all the way from the Golden Age to now.
Value is a different beast. I have omniboo I could easily sell and get $800 or so for. More than a few actually. But there's one rather major pitfall with thinking of them that way: they could be reprinted at any moment, and then that value is close to nothing again. So if you're in it for money, I wouldn't recommend it, but if you're in it for the love of comics, I believe it's a great way to go. A nice oversized hardcover makes for a great presentation, especially when they use a nice paper stock (which doesn't always happen, alas, a big problem with a premium product like this).
But in the end, you do you. Collect how you want, and let's talk about the true joy of comics: the wonderful stories and art we get to share and enjoy whenever we want.