from what i understand it is only possible for a person to boost one server at a time and for only one boost. i wish their was a way get boosts for a server outside of a nitro subscription, like charging 1 dollar per month per boost. i don't feel like people are likely to upgrade from classic or buy nitro outright just for this one feature, and while it is a nice bonus that they can now do it, i think making it a separate option would make people allot happier.
It may result in higher revenue for discord by both letting people who want to spend more money than the basic 10 be able to, allow people a cheaper option to support discord who see 50 a year as too much (also serving as a lower bar to get people comfortable with spending money on discord), and lastly would allow people who do not care for nitro perks themselves the option to spend money to benefit their community instead.
personally I fall into the later category and would happily pay a couple dollars to get more emojis for my favorite server for example.