While I agree with the spirit of this comment, I would suggest that it does not really work like that. There are some aspects of running a business (eg support, maintenance, etc) that do not scale linearly like you propose. Running 3 $500/month businesses is much harder than running a single $1,500/month business.

In all likelihood, your $500/month business will open a door to a $1,000/month business which will lead you to a $2,000/month business. You have to think of each part as a step on a path. You will never get to the last step if you never take the first small steps.

To be clear, I am totally in agreement that the important thing is to start wherever you can.

Now you are running n businesses — tuning just one is tough enough.

“Hey Bob, we have a customer support ticket for business 65”

“What does 65 do again?”

Name your businesses better.

Very few of these micro-saas businesses will even hit $500/month. You wind up with a lot of crap you have to maintain. It's death by 1000 cuts.

That depends on how you design it. OP said “super simple” so assuming a very basic feature set and maintainable code.

That seems oversimplified

Step 1: Start Business

Step 2: ???

Step 3: GoTo 1

Step 2 is make $500 / month, duh.