@sarae Marking something as a favourite is saying "I like this"; boosting it is saying "I think this has value to the people who follow me." My guess is that people who say this find that people favourite their stuff much more often than boosting it.
That's a reflection on what they post, not on other users.
Trying to dictate how the platform gets used is futile. If they want more boosts, then maybe they should work on content that people feel is boost-worthy instead of trying to make it someone else's problem.