Sealing paving stone driveway
 

So my new place has a driveway of about 30x30 made of paving stones and I'm thinking about sealing it but I know pretty much nothing about sealing this kind of stuff so...

- Is it worth it? Pro/cons of it?
- I don't want to do it myself (don't have the time or desire) so who does this kind of stuff?
- Ball park cost for something that size?
- Should I do my concrete patio and sidewalk as well? (About 200sf of concrete)

Thanks,