Do you realize that 50 or even 100 posts on MR compared with several millions sold IS statistically irrelevant ?It still qualifies as anecdotal evidence because according to polls right here on MR taken at the time of preordering, the demand for the 6+ and 6 among members was split evenly at 50:50. Given this along with the more posts from members with 6+ (which was limited in supply) who had second thoughts about it compared to members with 6 (more plentiful in supply), this carries more weight than just dismissing it as statistically meaningless.
It's still not "real statistics," but if it were the other way around (more posts from members with the easier-to-get iPhone 6 having buyers remorse and wanted the 6+, which is constrained in supply), I'd be more inclined to say it's statistically meaningless.
MR isn't real world. Actually any tech forum like this is very different from real world.