Since this is essentially what I have ended up doing, I may be able to give you some perspective on it.
Background: I was part of a small club DZ that was in decline. The two members that were riggers both left and the club didn't have one anymore. So, according to the rules, the TIs had to pack their own and we couldn't do Static Line or AFF students (by that time the two AFFIs had left too).
So, in 09, I went down to Para-Concepts and took the course. It was an excellent course and I would recommend it without reservation (keep in mind it was 13 years ago and may have changed).
While the reserve repacks were a primary focus (including rounds), the course was very comprehensive.
So I became the club rigger. I did all the student rigs and did the 'supervision' part of packing student & tandem mains. The TI wasn't totally comfortable with my level of experience and had the tandem repacks done by one of the former club members/riggers. I didn't have any issue with this.
I would also do the repacks on club members' rigs.
When the club closed down in 2012, I kept doing friends rigs, but that was about it. As I got older (knee & shoulder issues) and less and less current, I chose to not do other people's stuff. I know my Infinity inside, outside, backwards & forwards (I still pull out the manual when I work on it). Other rigs? Not so much.
So, by Mark's very apt definition, I'm a 'perpetual entry level rigger'.
Was it worth it?
I think so. The knowledge I gained during the course was really cool. I learned a boatload of stuff about the gear. I've been able to pass some of that on to newer jumpers, which is nice.
Did it 'pay for itself'?
I don't think so. Between the course, course materials, tools (I'm always happy buying new tools), tests, travel expenses and such, I probably spent close to $2k for the rating. Since the student stuff was to keep the club going, I didn't take actual pay for it, just credit on the books. I didn't pay anything for my jumps those last 3 years, but still had a fair amount of money owed me when we shut down - I pretty much knew it was going to be that way from the beginning. I was just happy to help keep the doors open.
I'm not going to tell you which way to go. That's up to you.
If you want to gain a fair amount of knowledge about the gear, if you want the freedom to take care of your own stuff (I also do most of my own work on my vehicles too), if you simply want the rating to be able to say "I'm a rigger", then go for it.
But keep in mind that you likely won't be legally current, you won't be experienced on anything other than your own stuff, you will be lacking in many areas.