The new boost-farming contract applies a fixed user storage fee policy despite the real storage a farmer occupied (0.1 near for each farmer), the backend logic is to have a dynamic-balance among heavy and light farmers.
So, to ensure we have a healthy storage condition, it is necessary to have some near put in the contract as a protection for some rare scenario.
Now, for this boostfarm.ref-labs.near contract, we would apply for a 1K near deposit for that purpose.