didnt spend a penny
have bar mini and 43 more guns
All the jobs give approximately the same gralats, the average is nearly the same spending on how much time you do the job, the amount and quality, if you dig shells and sell them for 1 trochus= 2 aerolatas in trade tables, for 100 trochus you would then get 200 aerolatas, instead of getting 300 gralats you would get 600 gralats, because trochus and aerolatas are both 3 gralats each one, doubling up your benefits, you can sell your trochus for aerolatas in small amounts.
If you want to get more money and if you want to get money faster, then I would go with digging. I would go with digging because each hour you can get a lot of shells. You can get between 500-1000 shells each hour by digging. This means that you can get between 1500$-3000$ if you sell all the shells you get each hour. That is my opinion, although I know a lot of people have different thoughts. So not everyone would agree with me. Probably many people would say making pizzas or doing car missions. These jobs are very good too but I would go with digging.