Thats why you don't buy your cubes all at once...
Would you rather have one big gift or many small gifts over a period of time?
Why compromise with 1 big gift every once in a while or small gifts all the time when you can get big gifts all the time?!
I like collecting things (which explains the 150+ board games that I have,) so I went out and got a bunch of cubes at once.
Why would you buy a bunch of very similar cubes, i.e. a few Dayan/MoYu cubes? For me, the HuanYing and Fangshi were impulse buys, I don't really like them. In an ideal world, I'd have less black 3x3s, and don't intend to buy any more. For me, variety is the spice of life. Why not get different colour cubes, like white or milky, or different puzzles like pyra/mega/4x4/5x5...
I picked up 6 from a local guy from here just yesterday actually. I liked how all of them felt, but I figure that I needed more time with them all to know which my favorite would be. I have several of the same cubes, just in different colors. I gave white cubes a try.. and I don't really like them for some reason. I preferred stickerless, but they are not competition legal, and my wife doesn't like the way they look. So I actually have a stickerless Lubix GuHong V1 and a stickerless Lubix Zhanchi that I am replacing with black ones (already on order!) I have a white Shenshou 4x4 and a white Moyu Weilong that I replaced with black versions as well.
I also like to keep a set of cubes in my office and my favorite ones on every floor of the house so I don't have to run up and down 2 flights of stairs to find the cube I want!
Differentiating cubes wise - once you played each of them enough you'll be able to tell whats what. This also applies with new cubes/broken in ones.
I'm not skilled quite enough to tell the difference between certain ones, but I can tell between a Weilong and a Zhanchi, but not really between Zhanchi and Guhong (both are Lubix, however.)
I thought I didn't like Zhanchis at all, but they are growing on me. I thought I would like the GuHong the best, but then I discovered the Maru CX-3 and love the way it feels. Now, I am obsessed with my WeiLong. This all happened in the span of about 3 days!
I'm keeping most of them in boxes, so I only have about 7 rogue cubes right now, 2 of which are in my office. I can tell the difference between these now because they have different stickers or colors (white/black/stickerless.)
Current Collection:
Moyu Weilong (Black and White)
Moyu Huanying (Black)
Dayan Zhanchi (Stickerless with no mods, Lubix stickerless, Lubix Black 57mm and 55mm)
Dayan Zhanchi 2x2 (Lubix Black)
Dayan GuHong V1 (Black with 48pem by previous owner, Lubix Stickerless, and Lubix Fusion black)
Dayan GuHong V2 (Lubix Stickerless)
Dayan LingYun (Lubix V2 Black)
Maru CX-3 (Black)
MF8 Square-1 (Lubix Square 1 Black)
Shenshou 4x4 (2 Black, 1 White)
EastSheen 2x2 (Black)
Thanks everyone for your inputs!