But you have to grind like hell and pay a lot of money for it. And nobody sees an Elite explorer rank exept for yourself, so I don't really care.
1) Decals - so people can see it.
2) Access to Shinrarta Dezera. If you are not an early backer, then you have to get Elite in something. For me Explorer is my furthest progressed rank, so its the one that will probably get me access first.
3) You have to risk carrying around lots of data while getting that rank 5. Even in solo, a mishap can happen...
Personally, the time and effort to put in to get Rank 5 while flying around with a load of exploration data is not something i'm interested in. I'd rather just stay out in the black longer and enjoy that.
Now, if there was a cumulative exploration benefit based on rank, then it could be more interesting. Eg: 10% at rank 1, 30% at rank 2, 60% at rank 3, 100% at rank 4, 200% at rank 5....