I think the point is that it isn't realistic, and WIS said it would be changed to be more realistic.
Realistically, a 6-yr MLFA with a higher OVR and AAA experience might shoot for $1M or so, and maybe he gets it, or he gets signed mid-season for $250,000 or so, and plays in AAA. A guy with a lower OVR might ask for $327,000 and get it, or get signed for $100,000 or so midseason.
Anything beyond that basically guarantees that a) the guy won't get signed for what he wants, and that b) he'll remain in FA limbo forever, because he'll never be cheap enough to sign as a minor-leaguer mid-season.
Losing those 25 or 50 guys each year can take a toll on minor-league depth. And given that they aren't true major-league prospects, it's not fair to ask owners to keep them on their 40-man rosters, just so that they stay at $55,000.