That's self-reported information and that's used only for marketing purposes (so GMAC can sell your score report to schools and it is used to filter you out by graduation year; same is for the self-reported major and GPA - they are not official data points)
As to the overall point of why they sometimes ask for the unofficial score report - Some do want to see your GMAT History (unofficial score report that lists all GMAT attempts).
Historically GMAC and Schools emphasized the message that multiple scores did not matter but when the GMAC changed their policy last year and made it possible to cancel and restore scores, some schools got upset and caught off-guard, so now some are requiring applicant's GMAT history. We don't know the exact use each school has for this. However, we do have little evidence to suggest that they discriminate against any specific group of candidates (e.g. those who took the gmat 2-3 times or showing any preference only to those who have taken it only once). My guess they just want to see it to make sure nothing crazy is there (e.g. 300 and then 750 or 12 attempts over the last 3 years).
Bottom line - I would not worry about it.