It would seem that I am a bit of one. I am currently sitting on the appx equiv:

2,600,000 on DL
2,600,000 on KL/AF
800,000 on BA
600,000 on LH
200,000 on BD
250,000 scatter in smaller airlines
1,300,000 points on Hhonors
400,000 hotel scatter

My wife and son, under my tutelage probably have close to 750k on various airlines.

When I started doing this a long time ago I was single, then I was married and then I had a kid. Therefore while the numbers grew and grew for years, I would say that my absolute numbers have not grown much over the last 5 years and have in effect been treading water, I am able to do this because despite burning anywhere between 350-600k a year I still fly paid BIS miles of appx 300-350 a year which in essence means that my balance(s) remain stable overall (i.e. my BA balance is way down from what it used to be because I don't like what they have done to their programe and have reduced flying with them, but my LH balance and KL balances have grown).

The retirement idea is a nice one, however if the hoarde can last me and my family into the foreseeable future for our rare "big" holidays and the occasional emergency I will be happy.