How many famous people end up committing suicide or in alcohol treatment?
No specific number is given. The text asks rhetorically how many famous entertainers end up committing suicide or entering alcohol treatment like the Betty Ford facility. It uses this as an illustration that worldly fame and its pleasures pass quickly, while eternal things last forever.
Les teaches that we should look at the lives of famous people and entertainers. They may seem to be living high on the hog, but it lasts only a few years. Then the flush of beauty wears off, and they are cast away, no longer important. He then asks how many of them end up committing suicide, and how many end up in the Betty Ford facility, alcohol treatment and what have you. His point is that the things of this world pass like a blade of grass that comes up in the morning and is cut off in the afternoon, while the things that are eternal last forever and ever. This illustrates the temptation areas common to all men—the lust of the eye, the lust of the flesh, and the pride of life—which Eve faced in Genesis chapter 3.