I don't know why you're trying so hard to change my mind and I really don't care. I've laid out the facts and don't want to keep going round in circles with you. You're welcome to your opinion, but don't foist it on me.
The comparison makes no sense though. You're comparing just XenForo (which is comparable to just the "forums" package in Invision) to the entire Invision suite, which includes packages that aren't even offered by XenForo. If you want to compare just base XenForo without any additional functionality you'd compare it to just the "Forums" application in Invision, which would be:
Renewal: $25/6 mo | $50/yr
Comparing just base XF to the entire IC suite is just ridiculous, they're not the same and XF doesn't claim that just the base software does everything the entire IC suite does