It's just too cheap to concern yourself with. I have about 1TB of content at the moment (roughly half of my total drive capacity) and I'm struggling to find more stuff I want to get. I have about 70 movies, the complete series of 10-15 tv shows, a few dozen audiobooks, 10 gigs of music, and 10 or 20 ISOs of various pieces of software. . .there's just not much more I want. Movies and shows are very finite. I've already got the good stuff by now. I rarely listen to music, so that's not a big issue. And the total runtime on my audiobook collection is on the order of months. I listen to them for about an hour a day during my commute, and at that rate, I have many, many years of book listening ahead of me. Oh, and I get a new ISO every few months.

Point is, I've got enough space for the forseeable future, and spent about 130 dollars for that space, all told. Dirt cheap.