Last year, I opened an Etrade account for $10k in cash to get the 10,000 United mile bonus. After 6 months I transfered the entire amount $10k + interest back to my Charles Schwab account, leaving my Etrade with a zero balance.
In April I transferred over $50,000 of Qualcomm stock from Charles Schwab to Etrade under their promotion to give me 25k UAL miles. Of course, Qualcomm dived to well below $50,000. To my surprise, Etrade gave me 20k UAL miles in July, less than 3 months.
I'm planning to move back my much smaller nest egg back to Charles Schwab and wait for the next Etrade promotion. However, I'm just hoping that I have the $50k for the next minimum.