The reward chart in Reception... Help me see a different perspective!

[MayDayChild]

there is a big display on wall of rocket and each child has named star. Effort is rewarded and they move up the chart to the moon.
So 1st child in class reaches moon and gets a prize (toy from pound shop type) but coveted clearly!
DD comes home sobbing that x got to the moon and she isn't good enough to get to the moon.
I checked the chart today, she's probably about 8th position of 25 so I'm proud regardless and told her this.

Concerned that top 4 are all girls. Then one boy then more girls.

There is no written or defined rule set or structure to what constitutes effort. It isn't tangible and is teacher viewpoint.

So I don't know what if anything to tell DD. I can't see that the girl who got a prize, or the next three girls in line have behaved any differently to DD. It's week 3!
I may be overthinking DD reaction but I think she can see that the others haven't done or been more 'special' than her.

Wise MNetters. All views welcome please!

I never had a problem with the 'super sunshine' thing because all the kids START on the sunshine. Not without problems, but not wholly crap. But the 'climbing' ones are hateful. When our head introduced them we asked if we could put them in individual homework books / reading logs instead, and so the school now operates a mixed system where some teachers show this and some don't.

The same problems are surfacing about differentiated target boards (the must, should, could, could evens) if people are sticking names on-great for those progressing to know they are, but couldn't this all be done on a more individual and less public basis? We have to do these now, although are thinking of ways round it.

And behind those lies OFSTED-the expectation that an inspector has that every child should know where they are and what they could do next. And what better way to show that at a glance over a visit than to have a display in the classroom, regardless of how well the kids understand of the teaching is differentiated?

I console myself that on the whole it's only making visually available what kids know anyway-that x was praised for doing something well, y was naughty, and that kids who play up to gain acclaim for being naughty don't do so that much more just because it is displayed.