I've had a Sol permit for ages... Counts for jack... Been doing missions out of Abe Lincoln .... Killed truck loads of pirates .. Most ive got to is neutral midshipman..now I'm offered next to nothing.... . and cant believe all the cmdrs flying around aimless at Sol Nav point ..why ?
When I started I dumped an entire hold full of illegal goods outside a federation station entrance, and was fined around 120k, 5500 is peanuts. Reputation and rank gains take effort, and "hours" wont cut it; I am now Allied Ensign, although I no longer receive promotion missions, since I can no longer gain rep with the federation. Run missions out of federation aligned stations to improve rep, aimlessly killing random ai results in minimal increases.
As for sol a lot of folks are interested in working out of Sol and why not, ignoring the fact it is where Earth is located, it is still a decent system to buy upgrades. It was also inevitable there would be hot spots within the game where ppl focus their efforts and hang out, Sol is just one such place.
EDIT, forgot to point out that there are a number of rare variations of weapons that will be reintroduced to the game at some point. They were withdrawn at the end of closed beta. These weapons and components have better characteristics than the base version, some do more damage and iirc bore the tag [overheated], some drain less energy etc, and these will be available from systems like Sol that require permits to access.