At first i thought I'd never use it.
But actually i am using it non-stop.
It's allowed me to max out and exceed the limits for all SH currencies.
Plus it's allowing me to build the fancy SH pier tiles for cash instead of grinding. I've found it's totally worth it to not have to deal with sending everyone to SH for the nonsense of grinding coffees, chairs, mats, pills, phones, and ads, just to get the tiles.
So yes, seems expensive, but i guess that's what convenience (and my time) is worth.