I pad attention back in the 80s and 90s, and even was able to recognize some cover artists by their style, but not anymore. I'm one of those for whom the cover on a Kindle book is of little importance--On Amazon's website they are small enough not to make a big impression, and there is a lot more information in the forms of professional and reader reviews and such on the web page that is a more efficient way for me to make a judgement on the book.
About the only way covers affect me now is that if a cover is spectacularly amateurish or bad, I'll be more suspicious that the book content is unedited or has other problems.