In my opinion, You must regularly claim the faucet when you have exchanged your RP for boosting rewards from the faucet, at least you have to roll more than 10x, less than that RP will be wasted.
Spending RP on claiming the bonus booster will only be effective if you are sure you will have a lot of free time or you will be able to recoup even more than you spent after activating it. If you have not yet achieved the goal of reaching 100K RP, maybe you should target to reach it first rather than being included in winning the lottery contest because it is not easy to win there. We get free lottery tickets at WOF. And we can also change to get RP in exchange for lottery tickets in the settings.