In every other game I have played, (except for the first game Strive4Power), when I played sandbox mode it meant I had unlimited money... not increased starting money... If it isn't too much to ask... Could you either make a new game mode where you have unlimited money, or change the current sandbox mode to have unlimited money? (It really doesn't matter to me what the new gamemode would be called...) Or maybe you could create an option to enable unlimited money in the sandbox mode world creation thingy. Now I don't actually expect my suggestions to be heard and/or made a feature... Because I have never had my suggestions about anything implemented before...

I've never played a game where sandbox mode gave unlimited money. However, there is a way for you to come close. Sign-up as a patreon and get the cheat code (this is actually made for debugging). You can get all the money you want. Although one of the main goals of this game is to make money and lots of it. Otherwise you can edit the starting presets for sandbox mode to give yourself an enormous amount of money.  This game is made to enable modding, though it is not complete enough to make that worthwhile at the moment. Don't be passive.