It's not that weird. In the 200+ k salary range, one level of primary skill is worth around 25k.
The value of a skill level rises exponentially. The higher the skill is, the more expensive is another level.
That is true, no doubt,but I feel the point is somewhere else - Why players with more skills are cheaper while they are the same at primaries? This also could be ok for everyone else as it was until two seasons ago when it become an issue for BBs and they decided to fix it and they announced - hey everybody, we are going to fix the fact secondaries, that are important in this game, and are worth nothing in salary, are going to reflect their importance. And as result, there is no result and issue was announced fixed but will be closely monitored in future in case it will become an issue again.
1 BBB, 20 Leagues, 10 Tournaments, 3 Europe Titles (SVK), 2 World Bronzes (SVK), 2 Europe Bronzes (SVK,FRA), 42 Seasons NT coaching