KLM does it at the tiny lounge in SFO. It is a table with a sign that says reserved. Then they bring ins some 'vips' who are served a drink and snack. It looks a bit silly. But it is nice to get a seat in a lounge that is way to small for KLM and AF departing around the same time @ 2pm.
Racking up lots of miles is not that difficult if you are unlucky enough to fly them. I did a year with 25 WBC returns (one week there, one home) to Tanzania and that was more then 300K in level miles.