I've not been concerned greatly with arming spark, which in my system would manifest in the arming plug, but I do regularly check the connectors (EC5) and to date (around 250 flights) they've shown no arc degradation. I may be lucky though.

I would think that using something like an anderson or an EC5 with lots of contact area would mean that you'd throw away the connectors for being sloppy from thousands of cycles over a degratation in connector.