With housing values soaring on the west coast and elsewhere, many people can have a net worth of $1 million+ while still living paycheck to paycheck. $30 million+ would be nice
To me, an entry level millionaire is someone who can regularly fly first class and live in a nice place most anywhere in the world he wants, without needing to work any more than he cares to for the rest of his life.
A serious millionaire would be someone who could effectively pay cash for his own jet, helicopter, heli-pad equipped yacht and mansion without making too much of a dent in one's finances.
I know several people of the entry level type, but only one of the latter (net worths ranging from ~$5 - 200+ million). All of them are incredibly disciplined and enjoy their work, with the wealthiest also being the most colorful.