There's a fascinating cohort emerging in the retirement investment space—let's call them the "sensible millionaires." These folks have somewhere between $1 million and $5 million parked in their 401(k) accounts, yet many still hunt for deals and clip coupons like it's second nature.

What's interesting isn't just the size of their nest eggs. It's the mentality. This group keeps expanding, and they're proving that accumulating serious wealth doesn't mean abandoning frugal habits. Some of these investors built their portfolios through decades of consistent contributions and modest living, never quite shaking off those money-saving instincts.

The sweet spot between $1M-$5M represents a specific tier—wealthy enough to feel secure, but not so wealthy that every dollar becomes meaningless. Maybe that's exactly why the coupon-clipping continues. Old habits, combined with the discipline that got them there in the first place, don't just disappear when the account balance hits seven figures.