What is the best business in EVE for big capital like 100b to 300b.
Using the trustworthy ISK doubling services in Jita local.
lol, you advise the scam! or do you joke.
I’m totally serious of course.
… but only use the trustworthy ones 
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You could set up about 3 skill extractor farm accounts. It’s not a huge return on investment, but it’s a steady income that requires low maintenance.
Buying a blingy ship to run incursions
You could offer loans. 
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How about secure collaterals?