Sag A* is worth about 300k now. I think the best ELW is only worth 60k, which should mean a "honk" value is only 10k.
This does sort of show why ice/rock planets aren't worth scanning. You get ~50% of their value from the honk alone, so jumping to another system and honking again is almost certainly going to get you more income than the time it takes to travel and scan.
I sold data last saturday. Sag A* worth ~600k and The Great Annihilator ~300k
I noticed that some planets without surface scanner worth ~10k, 15k or even 20k