Right, so that's not really a card hobby, that's just gambling. Especially if the aim is to literally sell it immediately, it's a pretty degenerate form of gambling. Sounds like the guy who stands at the convenience store counter scratching off the tickets he just bought so he can cash them in and buy more scratch off tickets.
I would definitely handle my cards well and put them in the proper type of holder to protect them. Why would I take a chance that someone else will probably do that? That's not a reason to have someone else break the box open, if anything it's literally a reason not to have someone else do it.
Again, that's also something I can do, involving someone else in that process doesn't seem like a compelling reason. If someone else opens my pack and sends in the card to be graded and it comes back as anything less than perfect, can I sue them?
The whole thing seems to boil down to gambling/adrenaline porn. Which is fine, if that's what people are into. Just seems really dumb to me, and basically an entirely different hobby altogether from card collecting.