While the incentive is obviously to delve into more expensive dimensions that can thus carry more items right off the bat, I really feel that people should have at least a little more freedom in placing objects in the basic dimension, and thus to not have a 120 item limit, but a 200 item limit (or more). This is still substantially lower than most dimensions, but I really think 200 would make world of a difference.
I made a dimension on Faeblight. It's currently ranked fourth out of all the dimensions on the list, which is incredible seeing the negative feedback people seem to be saying regarding the free dimension, Sanguine Shores. This puts my dimension, the "free" and "lame" dimension, above many of the more expensive ones. It's only the beginning days and many great dimensions are being built as I type this, and my ranking wills surely plummet at some point soon, but for now I just want to prove people wrong about Sanguine Shores by making a dimension to inspire and motivate. Regardless of what dimension we have, 200 items to place, at least, would make a huge difference. The current 120 limit goes fast!
If we ultimately did like our dimension, why should we be limited? We're still sinking our money and time to collect all the additional items to place in the dimension, so it's still an effort that shows dedication to the game. You don't (necessarily) need the biggest dimension to be the best!
My name on Faeblight is Zenaan and the dimension is called Cozy Sanguine. If your around and your willing to make a visit, come on by. Let me know what you think. Once you see it hopefully you'll realize what I mean when I say that even in a free dimension, it's amazing what you can accomplish. With more items, you can accomplish even more!