Unless you have decent chance of winning the lottery lets say atleast 1% chance to win then you better keep your RLB because it could worth more in the future. There are tons of people wagering their RLB away in this lottery so there is no reason to throw in your RLB in the pool as well just because you feel 'lucky' with your 0.01% chance to win
Are you sure you dont get back your rlb after you join the lottery? Because i see the fee to join is 0.2%
0.1%. To be burned and 0.1% the prize. So its either you never used it like me or i was wrong.