This is going to be addressed as part of the offseason changes. However, we really do not see it as poorly balanced; 5th place teams have no chance of being relegated. Would any 5th place teams truly prefer to risk relegation in order for an extra game's payout?
In Swedish division a team tried really hard to finish 6th and even lost to a bot team in last match to get these relegation matches despite the small risk of getting relegated. Team that finished 5th wanted to avoid 6th position because of the risk of relegation.
So there are examples. And I would also try hard to finish 6th if I had little or no chance of promotion even if I actually could get relegated. You also get to chose a draft pick earlier as advantage.
You also have the advantage of 3 extra matches which gives you more training so for me the advantages with 6th place is certainly worth the effort to avoid fifth.
It certainly is way too unfair. An alternative is to give very little money from attendances from relegation matches and to not make it possible to get one more match to get extra training minutes compared to 6th place finisher.
In another management game, Managerzone, there is extremely little attendance money from promotion/relegation matches to avoid unfair advantages of losing matches to get these extra matches. So not getting promoted and not avoiding relegation matches are not an option.
In my opinion, BB must make the 5th place worth more than 6th and 7th place. It should be a disadvantage to finish 6th or 7th both economically and for the risk of relegation.