Is there a way to accept but also limit greed that is reliable and durable?

Like a pragmatic meritocracy. We accept that there will be cheaters, and we won't catch or stop them all, but we have some hard limits. Do we care if you stop working so hard once you hit $1b? Maybe we'd even prefer that you did stop working (against societies interest!)?

This wouldn't even remotely resemble the communism bugaboo. It's basically saying, yes greed can be good, but at some point it gets ridiculous.