Originally Posted by TheDoc

Big companies just split the network they have up and keep it all under the same company.

Outside of that, they all used epoch/ccbill, etc either way and 3rd party processors keep an eye on xsales.. if you hit limits, they shut them off or give you crap about who you can xsale, which is why most moved in the first place. Basically xsales are rather safe on 3rd party processors.

Aggressive xsales are dead... xsales aren't ever going away though.