Drastic overdump or an invalid dump may get the cartridge itself to become glitched, misfunctioning, or broken forever.
Maybe he doesn't want to take any risks.
The screenshots he provided come directly from a ROM that he has. You cant get screenshots from a TV that are that good, its impossible
basically, he is being rather stupid and is deciding not to release the ROM for whatever reason, probably because it will lessen the value a little bit
thats why I think paying him for a copy of the ROM will work... but who knows, everyone should have the opportunity to play this as it is a rare one of a kind find that probably will never come about again, IE Sonic 2 Beta/Alpha, and the knowledge that would be given to the mario community would be priceless, however it is SMB2 and the game was pretty much complete with the release of DDP, but who knows there may be suprises that are buried within the depths of the game that only would be found by having the ROM.
but still, having this ROM would be peanuts if we got a Dump of SMB3 beta or the 1989 SMW
also, does anyone have the owner's email address so I can PM him
and ask him if he'd email me the ROM for a price? then maybe I can get some donations on some other forums...