TS, so why is the advice from certain forums bad? ...and if it's bad advice, why is this being openly promoted on certain forums and goes unchallenged by the more seasoned professionals like your good self? Surely bad practice should be stamped out in order to improve the quality of services being delivered.
IMHO, a variety of sizes of high quality condoms is not a big ask in return for the serious paperwork exchanged.
Mostly because the condoms are almost always pleasante, so tend to run small, be extra thick, smell awful, and only offered latex.
I do call out the idea that you should just work with the freebies, but admins over there don't often like certain ideas being challenged.
I can understand the mentality, save cash at all avenues, but I prefer to keep several different brands and sizes on hand. Does cost more in the setup, but you quickly learn the sizes you tend to run through fastest, and different shops mean they're almost always on offer. The only things I take from the clinic are femdoms and dental dams, just because they're bloody expensive and hard to find.