Mike has the measure of it, but I wouldn't assume all those 'bored' looking girls in HomePro are single. Very unlikely, or at least unlikely to not have love interests. They are mostly about commissions there and are big on cust service. Don't forget that Thais are supremely polite in that type of setup and it is easy to assume the attention you get is 100% genuine and that you could rock-on in short order.
Having said that, this is still one of the best places for getting hooked up. Forgetting P4P tourist areas for a bit, regards 'genuine' girls here, it is all about first appearances... same anywhere I guess, but esp in Asia! Don't worry about age, but being clean and well attired is an absolute must. You might not need Thai, but having nice shoes (especially), along with a collar and smile can work wonders.
Dunno the full story, but a guy in the above scenario strolling into a store here looking for action would have a markedly different success rate if he walked in with t-shirt, shorts and flip-flops compared with slacks, shirt and shiny shoes. You are halfway there without saying anything.