My best advice is to walk out if you're not happy with looks of provider. Often they'll show you the younger/better looking girls if they see you're walking. At least to me being visually aroused makes up 80% of the session. Trust me there's nothing worse than going through with a $.20 session when there's no attraction to the provider, at least with the k-orgs their service will usually get you going, even with little to no attraction(which happens often). Like someone else said when you find a girl you like, get her details and try to visit her as often as possible. In my experience the more you see a provider the better the sessions get.
If you decide to save up and visit a K-org, don't go in expecting the girls on the pictures. I honestly don't get how so many of these guys worship the K-orgs when often they provide you with an unattractive 40yr old, who yes is willing to provide all the services but do you really want those services from these homely aunties? When I get one of these providers, I usually skip the services that we're spending the extra cash for, so I end up paying $$.60/80 for a $.20 experience. When you get a decent looking girl, K-orgs are easily the best value. I don't walk out of K-orgs cause it's hard enough to get into them and don't want to risk being blacklisted.
It really comes down to what you're looking for out of your session, if you want the full GFE experience K-org is the way to go. Just realize not every session will be with the hot chick on the pictures provided. If you're ok with the $.20 service, only stay for the girls you find attractive and you'll have a good time more often than not.