No matter the fact that Nokia's Lumia 1020 is a much costlier device than the Lumia 928, which also happens to be a very capable WP8 Smartphone, the new 41 megapixel PureView camera equipped Lumia with a noticeable bump at the back is actually selling better. The price difference between the two devices is a whole $200. This should prove that cheaper phones doesn't necessarily translate to higher sales (although the Lumia 520 begs to differ).
Meanwhile, the market share being enjoyed by the low-cost Lumia 520 only keeps growing each day, its momentum doesn't seem to be slowing down, and most probably won't anytime soon (at least not until Nokia comes up with a large-screen Lumia 525 handset). AdDuplex also took a look at the 512 MB vs. 1 GB RAM divide and found that over 50% of WP8 Smartphones pack the lesser amount of RAM (the Lumia 520 alone eats up 27% of that share). Considering that only a very select few apps and games necessarily require more RAM, users aren't really missing out on much.
Check out more comparison charts such as the adoption of WP8 GDR2 (stands at a paltry 3%, for now), the market share among US carriers and more by following the source link.