It won't make you rich, it might not even earn you any pennies at all. But at the end of the day, it motivates you to keep writing. It teaches you how to deal with unrealistic expectations, how to remain defiant in the face of adversity, how to pull yourself from negativity and anxiety. The more you write, the more you dream the scenes, the more you contemplate upon the story, character motivations, character actions - and a better storyteller you become. I can tell you this from the bottom of my cold fiendish heart, downloads are not important, sales are not important, what is important is for you to bring your story or stories to completion. What is important is to never give up, but learn from your mistakes and strive to become a better writer, a better storyteller.
Like JFK said, an error becomes a mistake only when you refuse to correct it.
You don't have an editor? Don't despair, neither do I; and probably never will. Just read it again, and again, and again if you have to; edit it as much as you can - but don't be discouraged when you find typos and grammar errors even after several reads. It's natural, our eyes miss them. Our brain knows the lines, our tongue knows what's coming next, and our eyes simply miss them... So don't fret. Just fix the errors and then click on upload new version.
Everyone makes mistakes, you find typos even in the traditional medium, even at academic level. And always remember that as an indie you're not charging the sea and its salt for your ebooks. And you ebook readers out there remember that unlike physical books, the state perceives VAT on ebooks. So the author's cut, after retailer and aggregator take theirs, after income tax, and after VAT, we are left with crumbs - especially us who only have a handful of sales. There's no shame for us that there are children in 3rd world countries who make more money than we do from self-publishing. ^_^
If you love writing, if you have stories to tell and characters to flesh out, then you won't care about commercial success. Aspire first and foremost to conquer yourselves, after that the rewards will come. Happy holidays and good health. Peace out.