I had one job where the company gave annual 401k lump sums based on profit. Some of those deposits were upwards of $20k. No company before or since has boosted my 401k so much.

If the new company also matches, it'll probably make you more money than staying, because the max match is reset. If you really game it you might max out the match for both companies in the same year.

Well.... yeah. That's how they use benefits to encourage loyalty.

When I hit 5 years, I vest and my employer begins double-matching, including retroactive contributions. I put in 7%, so in another 2 trays they'll put 70% of my annual salary into my retirement all at once.

It heavily encourages loyalty because it's genuinely a great benefit. I have no problem with that.

I work for money, and the reward for loyalty is more money.

Beats the hell out of a pizza party.

It's still free money. Between maxing that ans espp, I basically got a free $16k last year.