Well, this is clearly the sort of question that needs SCIENCE. Out of the top three screenfuls of Google Image hits for "lolcat" (which was all I managed before deciding I couldn't be bothered collecting any more data), discarding things that are Demotivators-style posters or otherwise not typical image macro work, I count 29 all-caps lolcats, 30 mixed-case and 22 all-lowercase. That seems pretty well balanced, actually. I take back my assertion :-)

Cool :) I did pretty much the same, except that I stopped after 0 pages. Unfortunately, I was quite happy to believe whatever you said, as long as I didn't have to look at any lolcats :)