>I would guess that if costs is an issue then it must also be balanced compared to the potential profits. If your current $200 solution only allowed you to have US customers, while a $300 solution would allow you to have both US and EU customers, which one would you choose?

Whichever one let me pay rent at the end of the month

The US has plenty of customers. If I had to drop EU, I will. It's a nice bonus, but not a core requirement.

That seems good. Someone could copy your business and spin up on the EU market. If its profitable its profitable and its no worry for you. If its not profitable then the EU market is not large enough to carry the product on its own. GDP of the US is around $25 trillion, and EU is around $18 trillion, and population wise there are around 300 million people in the US and 400 million people in the EU.

Might I ask you what kind of product your 1 man startup have?

I am not 1 man anymore, we grew up a bit. But we are an ecommerce platform, basically centered around the big US marketplaces (Amazon, eBay, walmart.com). Yes Amazon and eBay are in Europe, so we are there.. but no say UK or France specific markets at this time.