Its called risk vs reward. I'll do this step-by-step.
Rewards are currently the same, both in open and solo. But when you take PC out of the equation and only have to worry about NPCs, it allows you to maximize income per hour. Going shieldless on your trade run to maximise profit is a popular example. That's not something you'd want to do in open, but its fine to do it in solo.
So...what do we have?
Open ; Higher risk // Equal or less rewards. You think thats balanced?
But you know what? That's not even my problem with Open. I dont mind getting less money in open, because it is more fun.
Like I said before, its the switch from solo/open that bothers me. Thats not balanced.
I'm not singling you our or anything JuicyFruits, more the argument being made.
So it's a trade off, and perception.
I'm going to go straight for real life here and say this.
I work for an investment organisation in London, I have a basic salary, bonuses and commission based pay schemes. IF I WANTED TO I could work through say the TSE (Tokyo) exchange day, then, work through the LSE day, then I could work through the NYSE then I could switch back to TSE, I could work like donkey 24/7, and potentially make a fair few numbers on my account balance.
Do I ? NO.
I have a young daughter start school this week, and she is more important to me than anything else this world has to offer. I'm not a material person, infact I'm quite happy to admit that I drive around in a 1996 Vauxhall Astra... Why? because i like it, it was my late fathers, and it has more sentimental value to me than any vehicle going.
How does all this translate to ED, well, SOLO might be a trade off between having fun with friends, or going about a task that quickly and effectively accumulates credit vs perceptions of 'reward'. I think Rob M said before, it's not what mode you get the credits that matters. I do not need a third party telling me how I should / should not earn credits in game, nor do I expect anyone in real life to dictate to me how many hours I work. I know inward, myself how much time I want to spend with my family or at work, and any day of the week time with family is more important TO ME than work. Work is essential to maintain a standard of living, yet it is not the most important thing.
THE MOST IMPORTANT THING is what makes YOU happy. Do not look at someone else and either try to force a change in their way of living to suit YOUR desires, but more over, approach the situation with a more subtle philosophy, try to encourage them to 'try' something new, maybe they like it maybe they don't, that's for them to decide. The important fact is for them to try, and for you to accept their decision. FORCING folks into OPEN is bad for everyone. Folks will moan about them, they will moan at folks, they'll moan at ED crews for forcing unappealing gameplay, they'll generate bad karma around the game, and that is BAD for everyone. Let people play ED the way that generates the most fun, and best experience as possible on balance. OPEN is not the mechanism to force so you have more defenseless PvEers to bully and pick on. Wait for CQC, and pit yourself against like minded individuals, it's win win, right?
I urge everyone to read something I was taught as as child, and I have taught the same to my daughter.
https://www.storyarts.org/library/aesops/stories/north.html
Think about it.