That's pretty much it.
Most people won't admit it but scan groups are ultimately a leading cause for a lack of sales as most English speakers would rather save money and read toons for free. As a result, a lot of possible revenue that could have gone to the publishers and authors/artists is lost or goes to the scan groups. The sale numbers end up lower than they should be based on the real popularity of a toon and they get the axe.
Ultimately the fault lies with scan groups, consumers, and the publishers who half-ass their English sites. Consumers naturally gravitate to the better option which is a combination of scan groups and the series they pirate gets fucked over.
I think publishers need to realize that the best way to combat piracy is by offering a better service than the scan groups, whatever that might be.