People who needs lots of RAM usually willing to pay extra for i7 and other expensive parts, and hardware manufacturers know and exploit that.

Fortunately, there’re some ultrabooks on the market with user-upgradeable RAM. This article says Intel CPUs supports 16GB DDR3L modules since Broadwell, i.e. you should be able to install 32GB yourself: http://www.techrepublic.com/article/16-gb-so-dimm-ram-module...