The salary floor in the NHL is meant to keep teams competitive and avoid tanking (well, also to boost salaries from the NHLPA point of view). But if the real NHL could use a 'minimum rating', they would. Salary doesn't translate into more wins, but higher player ratings in the HFNHL do (for the most part). As such, a minimum rating floor is a much better standard for our league's integrity.
In the HFNHL, there will be some high priced players with terrible ratings, which a tanking team could acquire to meet the salary floor, but end up as one of the worst teams in HFNHL history. And the rules would allow it and we'd be stuck watching a few teams race to the bottom.
Minimum rating is much better, although we always have to be a little flexible on it given the ambiguity of the OV, and it's tough some times for GM's to know in advance of the season just where their OV is going to end up.