We, as Zen Cart users, have it pretty damned good. I have a client who uses a commercial cart for which she paid some pretty good money. When we contacted the company that developed the software about an update to the Google feed, they called it a "custom" job and wanted $800. Never mind the fact that they could code it once and sell it to their entire installed base. I ended up contracting out her update to a coder who did it for $200.