"Is it worth it", well we can't answer that for you, only you can answer that.  However I can give you a of help for you to decide for yourself.

1. Do you do a lot of torrents?

2. Do you need your computer for other things?

3. Do you turn off your computer a lot during the week; ie over night?

4. Do you share the computer?

If you answered YES to any of those, you might want to consider a seedbox.

It's difficult to recommend a seedbox because it varies by region.  In Europe and North America {probably others as well} you can get full severs that you control or purpose built seedboxes that are completely setup for you to do torrents.  Getting a server tends to be a better value as you get a larger size hard drive for the same cost.  On the flip side is if you don't really know computers, then a pre built seedbox is a better value as it's all done for you.