They are.
But, it’s not a new phenomenon. There have been some real pips who’ve run for President.
Harold Stassen was a Republican who wanted to live in the White House so badly that he ran nine times between 1944 and 1992—he died just a year after that last run. He ran and seriously campaigned in 1944, 1948, 1952, 1964, 1968, 1980, 1984, 1988, and 1992.
Stassen was a serious politician. According to his obituary in The New York Times, “In 1953 the newly inaugurated President Eisenhower put Mr. Stassen in charge of American foreign aid programs. In 1955 Mr. Eisenhower named him special assistant to the president for disarmament matters, with cabinet rank. He remained in that job until 1958.
“In 1956 Mr. Stassen led an unsuccessful campaign to remove Vice President Richard M. Nixon from Mr. Eisenhower’s re-election ticket. In the early 1970’s, however, when President Nixon was faced with impeachment in the Watergate scandal, Mr. Stassen came to his defense.”
While he was a respected politician in some circles, he was also known as The Grand Ol’ Party’s Grand Ol’ Loser.
Comedian, Gary Owens, created a Harold Stassen for President radio spot in the early 1970s:
And like at least one of today’s presidential candidates—as he grew older, so did Stassen’s hair issues.

Harold Stassen and hairpiece.
To paraphrase Flounder, “Election cycles. You can’t live with ’em; you can’t live without ’em.”
To quote Harold Stassen, “I don’t care to be involved in the crash landing unless I can be in on the takeoff.”