For years must mean CAT5. You don't say.

The Monoprice CAT5 connectors, Product 7245, cost $5.77 per hundred. Six cents apiece.

How much does one failure cost?

Platinum EZ-RJ45 cost about 62 cents each. Since switching to them, I've NEVER had a failure except by my own hand. But we know of problems and doubts about those connectors.

The Belkin R6G088, recommended at [Link: ipcamtalk.com], costs about 47 cents. See [Link: amazon.com]

This should be a wake-up call that it's not worth it to buy them from monoprice.