Can't say I do myself, in all honesty. I take the view that there are sometimes too many categories of entitlement in airport lounges.

Personally I would tighten access even more than already happens, if I had my way. That's because I feel that eligibility (other than in the case of 'generic' lounges of course) should be restricted to those flying by the airline who has provided the facility.

And as an aside, I would also enforce much stricter control where young, poorly-behaved children are concerned.

I won't be at all surprised to get flamed by other posters. But hey, that's my opinion.