While the US visa is $160, it means you get to save on a pile of $14 ESTA applications :)
I’m not 100% sure how this works, but when OP renews their passport, they might need to keep their old passport because the visa is still valid, ie: travel with old and new passport. Not sure if the US works that way.
You can use the visa in the old passport but it must not be damaged. Some countries will punch a whole right through the old passport to invalidate it (thus damaging the still-valid visas), so you have to persuade them not to do that.
I’m not 100% sure how this works, but when OP renews their passport, they might need to keep their old passport because the visa is still valid, ie: travel with old and new passport. Not sure if the US works that way.