Apologies if this is in the wrong forum or redundant.
For those who have a decent sized stash in index ETFs, the brokers who compete for business occasionally offer incentives to open accounts or bump up existing accounts. This can create a small benefit for those of us who split our assets among brokers.
A quick search on deals will show that Fidelity is offering 50k miles for $100k invested, 25k for $50k, on three major airlines. The miles can be worth around $750, depending on how used, so a bit like a 1% bump (the best you can get in a savings acct these days.
If anyone has questions, feel free to post. Disclosure, I have accounts at Fidelity, Schwab, and TD Ameritrade, and find it worth the effort to move money for the incentive (as long as you don't buy any advice).