There were some spare $DEC in 
For the fun of it, I decided to use them half-directly in the *DEC-BUSD LP farm.
Half because I will buy $BUSD with half of $DEC in store.
Let's document the steps with $DEC already in 
1. buy $BUSD with $DEC
fee: 0.00112312 $BNB ($0.31)
2. add liquidity to receive LP tokens
fee: 0.0018332 $BNB ($0.50)
3. use LP tokens in farm
I already have a tiny amount of LP tokens in the DEC-BUSD LP. Adding newly acquired tokens will automatically provoke the harvest of $CUB.
Adding LPs
fee: 0.00118519 $BNB ($0.32)
harvested: 0.774 $CUB ($2.27)
These are tiny amounts and the farm widget displays 0 LPs. Still, they are there and working for me.
Conclusion
Around $1.1 in fees to put around $17 worth of $DEC to good use. Of course, it helps when absolute figures are bigger yet every little bit counts :)
Better and better