Fire Scout is required, resourced and paid for by the sneaky-guys. Why? Same reason as the rest of sea-based Navy Air - basing it off a boat means it's closer to the target and, more importantly, you don't have to worry about the politics of basing rights. UAVs being a particularly touchy topic with the host countries these days. There's been all kinds of issues with the countries - even NATO countries - that have hosted Preds, for example.
The Navy helo community, as far as I've seen, doesn't particularly want it (but since it's a helo, they don't want anyone else to have it, either). So they're perfectly happy to keep pitching it to Reservistas for the forseeable future. It's interesting contrast with how the VP bubbas have siezed on to the BAMS program, but there it is. Community politics.
It does what it's meant to do - long-duration (for a helo) ISR over less-than-friendly countries - perfectly well. It's doing a mission you can't really do with a -60 and wouldn't particularly want to. What other use it has, I'm not sure.