You know I have a lot of comics, more than my wife realy wants me to have. I tell her that they are important and that my son (8 now) will want to read them some day and it is something that we can share.
The thing is for key books, like the first Uncanny X-men Stories, Pheonix Saga, and most of the old Claremont stuff, I probably wouldn't trust him reading even when he is 15. So for certain stories, ones that I like to reread over and over again, or lend to other people to read I get trades, or essentials books.
So I would add to your list Joshua -- Trades are better for irresponsible people.
I'm fortunate that my comic shop Comic Evolution in Puyallup WA has the best trade collection I've ever seen in my life. He has at least 50FT of shelves waste high dedicated to trades.